FLIR Systems, Inc. and U.S. Bank National Association, as Trustee FIRSTSUPPLEMENTAL INDENTURE Dated as of August 19, 2011 to Indenturedated as of August 19, 2011 $250,000,000 3.750% Notes due 2016 TABLE OF CONTENTS

Exhibit 4.2

FLIR Systems, Inc.

and

U.S. Bank National Association, as Trustee

FIRST SUPPLEMENTAL INDENTURE

Dated as of August 19, 2011

to

Indenture dated as of August 19, 2011

$250,000,000 3.750% Notes due 2016

TABLE OF CONTENTS

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THIS FIRST SUPPLEMENTAL INDENTURE, dated as of August 19, 2011 (this “Supplemental Indenture”), between FLIR Systems, Inc., an Oregon corporation, as issuer (the “Company”), and U.S. Bank National Association, a national banking association, as trustee (the “Trustee”).

RECITALS:

WHEREAS, the Company has executed and delivered to the Trustee an Indenture, dated as of August 19, 2011 (the “Base Indenture” and, as supplemented by this Supplemental Indenture, the “Indenture”), providing for the issuance by the Company from time to time of its unsecured senior debentures, notes or other evidences of indebtedness to be issued in one or more series unlimited as to principal amount (the “Securities”);

WHEREAS, Sections 2.01 and 8.01(ix) of the Base Indenture provide that the Company and the Trustee may, in one or more indentures supplemental to the Base Indenture, amend or supplement the Base Indenture to establish the form and terms of any series of Securities prior to the issuance of any Securities of such series;

WHEREAS, the Company has duly authorized and desires to cause to be established pursuant to the Base Indenture and this Supplemental Indenture a new series of Securities designated the “3.750% Notes due 2016” (the “Notes”), the form and terms of such Notes to be set forth in this Supplemental Indenture;

WHEREAS, all things necessary to make this Supplemental Indenture a valid agreement of the Company and the Trustee, in accordance with its terms, and a valid amendment of, and supplement to, the Base Indenture have been done;

NOW, THEREFORE, in consideration of the premises and the purchase and acceptance of the Notes by the Holders thereof, the Company covenants and agrees with the Trustee, for the equal and ratable benefit of the Holders, that the Base Indenture is supplemented and amended, to the extent expressed herein, as follows:

ARTICLE I

DEFINITIONS

SECTION 1.1     Relationship with Base Indenture.

(a) Notwithstanding any other provision of this Supplemental Indenture, all provisions of this Supplemental Indenture are expressly and solely for the benefit of the Holders of the Notes and any such provisions shall not be deemed to apply to any other Securities issued under the Base Indenture and shall not be deemed to amend, modify or supplement the Base Indenture for any purpose other than with respect to the Notes. Unless otherwise expressly specified, references in this Supplemental Indenture to specific Article numbers or Section numbers refer to Articles and Sections contained in this Supplemental Indenture, and not the Base Indenture or any other document.

(b) Capitalized terms used herein and not otherwise defined herein shall have the respective meanings ascribed thereto in the Base Indenture.

(c) The rules of construction set forth in the Base Indenture shall be applied hereto as if set forth in full herein.

SECTION 1.2    Definition of Certain Terms.

For all purposes of this Supplemental Indenture, except as otherwise expressly provided or unless the context otherwise requires, the following terms shall have the following respective meanings:

“Change of Control” means the occurrence of any of the following after the date of issuance of the Notes:

(1) the direct or indirect sale, lease, transfer, conveyance or other disposition (other than by way of merger or consolidation), in one or a series of related transactions, of all or substantially all of the properties or assets of the Company and its Subsidiaries taken as a whole to any “person” or “group” (as those terms are used in Section 13(d)(3) of the Exchange Act) other than the Company or one of its Subsidiaries;

(2) the consummation of any transaction (including, without limitation, any merger or consolidation) the result of which is that any “person” or “group” (as those terms are used in Section 13(d)(3) of the Exchange Act) becomes the “beneficial owner” (as defined in Rules 13d-3 and 13d-5 of the Exchange Act), directly or indirectly, of Voting Stock of the Company representing a majority of the voting power of the Company’s then outstanding Voting Stock;

(3) the Company consolidates with, or merges with or into, any Person, or any Person consolidates with, or merges with or into, the Company, in any such event pursuant to a transaction in which any of the outstanding Voting Stock of the Company or Voting Stock of such other Person is converted into or exchanged for cash, securities or other property, other than any such transaction where the Voting Stock of the Company outstanding immediately prior to such transaction constitutes, or is converted into or exchanged for, Voting Stock representing a majority of the voting power of the Voting Stock of the surviving Person immediately after giving effect to such transaction;

(4) the first day on which a majority of the members of the Company’s Board of Directors are not Continuing Directors; or

(5) the adoption by stockholders of the Company of a plan relating to the Company’s liquidation or dissolution.

Notwithstanding the foregoing, a transaction (or series of related transactions) will not be deemed to involve a Change of Control under clause (2) above if (i) the Company becomes a direct or indirect wholly-owned subsidiary of a holding company and (ii)(A) the direct or indirect holders of the Voting Stock of such holding company immediately following that transaction are substantially the same as the holders of the Voting Stock of the Company immediately prior to that transaction or (B) immediately following that transaction no “person” or “group” (as those terms are used in Section 13(d)(3) of the Exchange Act) (other than a holding company satisfying the requirements of this sentence) is the beneficial owner (as defined in Rules 13d-3 and 13d-5 of the Exchange Act), directly or indirectly, of more than 50% of the Voting Stock of such holding company.

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“Change of Control Offer” means an offer to repurchase Notes pursuant to Section 4.1 hereof.

“Change of Control Payment” means, with respect to Notes tendered for repurchase pursuant to a Change of Control Offer, an amount equal to 101% of the aggregate principal amount of the Notes repurchased, plus accrued and unpaid interest thereon, if any, to the date of repurchase.

“Change of Control Triggering Event” means, with respect to the Notes:

(i) the rating of such Notes is lowered by each of the Rating Agencies on any date during the period (the “Trigger Period”) commencing on the earlier of (a) the occurrence of a Change of Control and (b) the first public announcement by the Company of any Change of Control (or pending Change of Control), and ending 60 days following consummation of such Change of Control (which Trigger Period will be extended following consummation of a Change of Control for so long as any of the Rating Agencies has publicly announced that it is considering a possible ratings change), and

(ii) such Notes are rated below Investment Grade by each of the Rating Agencies on any day during the Trigger Period;

provided that a Change of Control Triggering Event will not be deemed to have occurred in respect of a particular Change of Control if each Rating Agency making the reduction in rating does not publicly announce or confirm or inform the Trustee at the Company’s or the Trustee’s request that the reduction was the result, in whole or in part, of any event or circumstance comprised of or arising as a result of, or in respect of, the Change of Control. Notwithstanding the foregoing, no Change of Control Triggering Event will be deemed to have occurred in connection with any particular Change of Control unless and until such Change of Control has actually been consummated.

“Comparable Treasury Issue” means the United States Treasury security selected by the Quotation Agent as having a maturity comparable to the remaining term of the Notes to be redeemed that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of those Notes.

“Comparable Treasury Price” means, with respect to any Redemption Date, (1) the average of the Reference Treasury Dealer Quotations for that Redemption Date, after excluding the highest and lowest Reference Treasury Dealer Quotations, or (2) if the Quotation Agent obtains fewer than four Reference Treasury Dealer Quotations, the average of all Reference Treasury Dealer Quotations so received.

“Continuing Directors” means, as of any date of determination, any member of the Board of Directors of the Company who (1) was a member of the Company’s Board of Directors on the date of the issuance of the Notes; or (2) was nominated for election or elected or appointed to the

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Company’s Board of Directors with the approval of a majority of the Continuing Directors who were members of the Company’s Board of Directors at the time of such nomination, election or appointment (or such lesser number comprising a majority of a nominating committee if authority for such nomination, election or appointment has been delegated to a nominating committee whose authority and composition have been approved by at least a majority of the Continuing Directors who were members of the Board of Directors at the time such committee was formed), either by a specific vote or by approval of the Company’s proxy statement in which such member was named as a nominee for election as a director, without objection to such nomination or otherwise.

“Investment Grade” means a rating of Baa3 or better by Moody’s (or its equivalent under any successor rating category of Moody’s) and a rating of BBB- or better by S&P (or its equivalent under any successor rating category of S&P), and the equivalent investment grade credit rating from any replacement rating agency or rating agencies selected by the Company under the circumstances permitting the Company to select a replacement rating agency and in the manner for selecting a replacement rating agency, in each case as set forth in the definition of “Rating Agency.”

“Moody’s” means Moody’s Investors Service, Inc., a subsidiary of Moody’s Corporation, and its successors.

“Quotation Agent” means the Reference Treasury Dealer appointed by the Company.

“Rating Agency” means each of Moody’s and S&P; provided, that if either Moody’s or S&P ceases to provide rating services to issuers or investors, the Company may appoint another “nationally recognized statistical rating organization” within the meaning of Section 3(a)(62) under the Exchange Act as a replacement for such Rating Agency; provided that the Company gives notice of such appointment to the Trustee.

“Reference Treasury Dealer” means (1) each of Merrill Lynch, Pierce, Fenner & Smith Incorporated and Barclays Capital Inc. and their respective successors; provided, however, that if any of the foregoing shall cease to be a primary U.S. Government securities dealer in New York City (a “Primary Treasury Dealer”), the Company shall substitute another Primary Treasury Dealer, and (2) any other Primary Treasury Dealer selected by the Company.

“Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any Redemption Date, the average, as determined by the Quotation Agent, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Quotation Agent by that Reference Treasury Dealer at 5:00 p.m., New York City time, on the third Business Day preceding that Redemption Date.

“S&P” means Standard & Poor’s Ratings Services, a division of The McGraw-Hill Companies, Inc., and its successors.

“Treasury Rate” means, with respect to any Redemption Date, the rate per year equal to: (1) the yield, under the heading which represents the average for the immediately preceding week, appearing in the most recently published statistical release designated “H.15(519)” or any successor publication which is published weekly by the Board of Governors of the Federal

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Reserve System and which establishes yields on actively traded United States Treasury securities adjusted to constant maturity under the caption “Treasury Constant Maturities,” for the maturity corresponding to the applicable Comparable Treasury Issue; provided that, if no maturity is within three months before or after the remaining term of the notes to be redeemed, yields for the two published maturities most closely corresponding to the applicable Comparable Treasury Issue shall be determined and the Treasury Rate shall be interpolated or extrapolated from those yields on a straight line basis, rounding to the nearest month; or (2) if such release (or any successor release) is not published during the week preceding the calculation date or does not contain such yields, the rate per year equal to the semi-annual equivalent yield to maturity of the applicable Comparable Treasury Issue, calculated using a price for the applicable Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for that Redemption Date.

“Voting Stock” of any specified Person as of any date means the capital stock of such Person that is at the time entitled to vote generally in the election of the board of directors of such Person.

ARTICLE II

GENERAL TERMS OF THE NOTES

SECTION 2.1    Form.

The Notes and the Trustee’s certificates of authentication shall be substantially in the form of Exhibit A to this Supplemental Indenture, which are hereby incorporated into this Supplemental Indenture. The terms and provisions contained in the Notes shall constitute, and are hereby expressly made, a part of this Supplemental Indenture and to the extent applicable, the Company and the Trustee, by their execution and delivery of this Supplemental Indenture, expressly agree to such terms and provisions and to be bound thereby.

SECTION 2.2    Amount and Payment of Principal and Interest.

(a) The Trustee shall authenticate and deliver the Notes for original issue on the date hereof in the aggregate principal amount of $250,000,000. The principal amount of each Note shall be payable on September 1, 2016.

(b) The Notes shall bear interest at 3.750% per year beginning on the date of issuance until the Notes are redeemed, paid, or duly provided for. Interest shall be paid semiannually in arrears on March 1 and September 1 of each year (each an “Interest Payment Date”), commencing on March 1, 2012. The regular record date for interest payable on the Notes shall be the February 15 and August 15, as the case may be, immediately preceding each Interest Payment Date. Interest will be computed on the basis of a 360-day year comprised of twelve 30-day months. If an Interest Payment Date falls on a date that is not a Business Day, then interest will be paid on the next day that is a Business Day, and no interest on such payment will accrue for the period from and after such Interest Payment Date. If a Redemption Date or the Maturity Date for any Note falls on a date that is not a Business Day, the related payments of principal, premium, if any, and interest may be made on the next succeeding Business Day, and no additional interest will accumulate on the amount payable for the period from and after the Redemption Date or Maturity Date.

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(c) Subject to the terms and conditions contained herein, the Company may from time to time, without notice to or consent of the existing Holders create and issue additional Notes (the “Additional Notes”) having the same terms and conditions as the Notes in all respects, except for the Issue Date and the first payment of interest thereon. Such Additional Notes, at the Company’s determination and in accordance with the provisions of the Indenture, will be consolidated with and form a single series with the previously outstanding Notes for all purposes under the Indenture, including amendments, waivers and redemptions. The aggregate principal amount of the Additional Notes, if any, shall be unlimited.

SECTION 2.3    Denominations.

The Notes will be issuable only in fully registered form without coupons in minimum denominations of $2,000 and any integral multiples of $1,000 in excess thereof.

SECTION 2.4    Global Securities.

The Notes will be issuable in the form of one or more Global Securities and the Depository for such Global Securities will be The Depository Trust Company in accordance with the Base Indenture.

SECTION 2.5    Payment, Transfer and Exchange.

(a) The principal and interest on Notes represented by Global Securities will be payable to the Depository or its nominee, as the case may be, as the sole registered owner and the sole Holder of the Global Securities represented thereby. The principal and interest on Notes represented by Physical Securities will be payable, either in person or by mail, at the office of the Paying Agent.

(b) Transfers of Global Securities will be limited to transfer in whole, but not in part, to the Depository, its successors or their respective nominees. Interests of beneficial owners in the Global Securities may be transferred or exchanged for Physical Securities in accordance with the Indenture. If Notes represented by Physical Securities are presented to the Registrar with a request from the Holder of such Securities to register a transfer or to exchange them for an equal principal amount of Securities of other authorized denominations, the Registrar will register the transfer or make the exchange as requested in accordance with the Indenture.

SECTION 2.6    Registrar and Paying Agent.

The Company initially appoints the Trustee as Registrar and Paying Agent with respect to the Notes. The Company may change the Paying Agent and Registrar with respect to the Notes without notice to Holders.

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SECTION 2.7    Ranking.

The Notes will be senior unsecured obligations of the Company. The payment of the principal of, premium, if any, and interest on the Notes will (i) rank equally in right of payment with all other indebtedness of the Company that is not by its terms expressly subordinated to other indebtedness of the Company, and (ii) rank senior in right of payment to all indebtedness of the Company that is, by its terms, expressly subordinated to the senior indebtedness of the Company.

SECTION 2.8    Trustee’s Right to Refuse Directions in Certain Circumstances.

With respect to directions given by the Holders of a majority in aggregate principal amount of the Notes to the Trustee, pursuant to the Indenture, in its exercise of any trust or power with respect to the Notes, the Trustee will be entitled to refuse to follow any such direction that conflicts with law or the Indenture or that the Trustee determines in good faith is unduly prejudicial to the rights of other Holders or could, in reasonable likelihood, impose personal liability upon the Trustee, unless the Trustee is offered indemnity satisfactory to it.

ARTICLE III

REDEMPTION

SECTION 3.1    Redemption.

(a) Except as provided in this Article III, the Company shall have no obligation to redeem, purchase or repay the Notes pursuant to any mandatory redemption, sinking fund or analogous provisions or at the option of a Holder thereof.

(b) The Notes are subject to redemption at any time or from time to time, in whole or in part, at the Company’s option at a Redemption Price equal to the greater of (i) 100% of the principal amount of the Notes to be redeemed, and (ii) as determined by the Quotation Agent, the sum of the present values of the remaining scheduled payments of principal and interest in respect of the Notes to be redeemed (not including any interest accrued as of the Redemption Date) from the Redemption Date through the stated maturity of the Notes to be redeemed, in each case discounted to the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 45 basis points, plus accrued and unpaid interest on the Notes to be redeemed to the Redemption Date. The Company may provide in a redemption notice that payment of such Redemption Price and performance of the Company’s obligations with respect to such redemption or purchase may be performed by another Person. Any such notice may, at the Company’s discretion, be subject to the satisfaction of one or more conditions precedent.

SECTION 3.2    Redemption Procedures.

The Trustee will select Notes called for redemption in part on a pro rata basis or on as nearly a pro rata basis as is practicable (subject to procedures of the Depository); provided that Notes in principal amounts of $2,000 or less shall be redeemed in whole and not in part. In the case of Notes represented by Physical Securities, a new Note in principal amount equal to the unredeemed portion thereof will be issued in the name of the Holder thereof upon cancellation of

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the original Note. In the case of Notes represented by a Global Security, the outstanding principal amount of the Global Security representing the Notes will be reduced by book-entry. Notes called for redemption become due on the Redemption Date, subject to the satisfaction of any conditions precedent provided in the notice of redemption. On and after the Redemption Date, interest stops accruing on Notes or portions of them called for redemption (unless there is a default in the payment thereof).

SECTION 3.3    Notice of Redemption.

(a) At the Company’s written request made at least five Business Days prior to the date on which notice of redemption is to be given (unless a shorter notice shall be agreed to in writing by the Trustee), the Trustee shall give the notice of redemption in the Company’s name and at the Company’s expense.

(b) Notices of redemption shall be mailed by first class mail at least 30 but not more than 60 days before the Redemption Date to each Holder of Notes to be redeemed at such Holder’s registered address. If any Note is to be redeemed in part only, the notice of redemption that relates to such Note shall state the portion of the principal amount thereof to be redeemed.

(c) Any notice to holders of Notes of any redemption will include the appropriate calculation of the Redemption Price, but does not need to include the Redemption Price itself. The actual Redemption Price, calculated as described above, will be set forth in an Officers’ Certificate of the Company delivered to the Trustee no later than two Business Days prior to the Redemption Date.

ARTICLE IV

CHANGE OF CONTROL

SECTION 4.1    Change of Control.

(a) Upon the occurrence of a Change of Control Triggering Event, unless all Notes have been called for redemption, each Holder of Notes shall have the right to require the Company to repurchase all or any part (equal to $2,000 or an integral multiple of $1,000 in excess thereof) of such Holder’s Notes at an offer price in cash equal to the Change of Control Payment.

(b) Within 30 days following any Change of Control Triggering Event or, at the Company’s option, prior to any Change of Control but after the public announcement of the pending Change of Control, the Company shall mail, or cause to be mailed, a notice to the Trustee and to each Holder describing the transaction or transactions that constitute the Change of Control Triggering Event and specifying:

(i) that the Change of Control Offer is being made pursuant to this Section 4.1 and that all Notes tendered will be accepted for payment;

(ii) the Change of Control Payment and the purchase date, which shall be a Business Day no earlier than 30 days and no later than 60 days from the date such notice is mailed (the “Change of Control Payment Date”);

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(iii) the CUSIP number for the Notes;

(iv) that any Note not tendered will continue to accrue interest;

(v) that, unless the Company defaults in the payment of the Change of Control Payment, all Notes accepted for payment pursuant to the Change of Control Offer will cease to accrue interest after the Change of Control Payment Date;

(vi) that Holders electing to have any Notes purchased pursuant to a Change of Control Offer will be required to surrender such Notes to the Paying Agent at the address specified in the notice prior to the close of business on the third Business Day preceding the Change of Control Payment Date;

(vii) that Holders will be entitled to withdraw their election referred to in clause (vi) if the Paying Agent receives, not later than the close of business on the second Business Day preceding the Change of Control Payment Date, a facsimile transmission or letter setting forth the name of the Holder, the principal amount of Notes delivered for purchase, and a statement that such Holder is withdrawing such Holder’s election to have the Notes purchased;

(viii) that Holders whose Notes are being purchased only in part will be issued new Notes equal in principal amount to the unpurchased portion of the Notes surrendered, which unpurchased portion will be equal to $2,000 in principal amount or an integral multiple of $1,000 in excess thereof; and

(ix) if such notice is mailed prior to the consummation of the Change of Control, that the Change of Control Offer is conditioned on the Change of Control being consummated on or prior to the Change of Control Payment Date.

(c) The Company shall cause the Change of Control Offer to remain open for at least 20 Business Days or such longer period as is required by applicable law. The Company shall comply with the requirements of Rule 14e-1 under the Exchange Act and any other securities laws and regulations thereunder to the extent those laws and regulations are applicable in connection with the repurchase of the Notes as a result of a Change of Control Triggering Event. To the extent that the provisions of any securities laws or regulations conflict with the provisions of this Section 4.1, the Company will comply with the applicable securities laws and regulations and will not be deemed to have breached its obligations under this Section 4.1 by virtue of any such conflict.

(d) On the Change of Control Payment Date, the Company will, to the extent lawful:

(i) accept for payment all Notes or portions thereof properly tendered pursuant to the Change of Control Offer;

(ii) deposit with the Paying Agent an amount equal to the Change of Control Payment in respect of all Notes or portions of Notes properly tendered; and

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(iii) deliver or cause to be delivered to the Trustee the Notes properly accepted together with an Officers’ Certificate stating the aggregate principal amount of Notes or portions of Notes being repurchased by the Company.

(e) The Paying Agent will promptly mail to each Holder of Notes properly tendered the Change of Control Payment for such Notes, and the Trustee will promptly authenticate and mail (or cause to be transferred by book entry) to each Holder a new Note equal in principal amount to any unpurchased portion of the Notes surrendered, if any; provided that each new Note will be in a principal amount of $2,000 or an integral multiple of $1,000 in excess thereof. The Company will publicly announce the results of the Change of Control Offer on or as soon as practicable after the Change of Control Payment Date.

(f) The Company shall not be required to make a Change of Control Offer upon a Change of Control Triggering Event if a third party makes the Change of Control Offer in the manner, at the times and otherwise in compliance with the requirements set forth in this Section 4.1 applicable to a Change of Control Offer made by the Company and purchases all Notes properly tendered and not withdrawn under such Change of Control Offer.

(g) The Company may make a Change of Control Offer in advance of, but conditioned on, the occurrence of a Change of Control Triggering Event but otherwise in accordance with the provisions of this Section 4.1.

ARTICLE V

MISCELLANEOUS PROVISIONS

SECTION 5.1    Ratification of Base Indenture.

The Base Indenture, as supplemented by this Supplemental Indenture, is in all respects ratified and confirmed, and this Supplemental Indenture shall be deemed part of the Base Indenture in the manner and to the extent herein and therein provided. All provisions included in this Supplemental Indenture with respect to the Notes supersede any conflicting provisions included in the Base Indenture unless not permitted by law. The Trustee accepts the trusts created by the Indenture, and agrees to perform the same upon the terms and conditions set forth in the Indenture.

SECTION 5.2    Trustee Not Responsible for Recitals.

The recitals contained herein and in the Notes, except with respect to the Trustee’s certificates of authentication, shall be taken as the statements of the Company, and the Trustee assumes no responsibility for the correctness of the same. The Trustee makes no representations as to the validity or sufficiency of this Supplemental Indenture or of the Notes.

SECTION 5.3    Table of Contents, Headings, Etc.

The table of contents and headings of the Articles and Sections of this Supplemental Indenture have been inserted for convenience of reference only, are not to be considered a part hereof and shall in no way modify or restrict any of the terms or provisions hereof.

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SECTION 5.4    Multiple Counterparts.

The parties may sign multiple counterparts of this Supplemental Indenture. Each signed copy shall be deemed an original, but all of them together represent one and the same agreement.

SECTION 5.5    Governing Law.

THIS SUPPLEMENTAL INDENTURE AND THE NOTES SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

[Signature Pages Follow]

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IN WITNESS WHEREOF, the parties have caused this First Supplemental Indenture to be duly executed all as of the date and year first written above.

[First Supplemental Indenture]

[First Supplemental Indenture]

EXHIBIT A

THIS NOTE IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A NOMINEE THEREOF. THIS NOTE MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A NOTE REGISTERED, AND NO TRANSFER OF THIS SECURITY IN WHOLE OR IN PART MAY BE REGISTERED, IN THE NAME OF ANY PERSON OTHER THAN SUCH DEPOSITORY OR A NOMINEE THEREOF, EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE.

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO., OR SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY AND ANY PAYMENT HEREON IS MADE TO CEDE & CO., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

CUSIP No.: 302445 AC5

ISIN No.: US302445AC58

FLIR SYSTEMS, INC.

3.750% NOTE DUE 2016

FLIR SYSTEMS, INC., an Oregon corporation, as issuer (the “Company”), for value received, promises to pay to CEDE & CO. or registered assigns the principal sum of $250,000,000 on September 1, 2016.

Interest Payment Dates: March 1 and September 1 of each year, commencing March 1, 2012.

Record Dates: February 15 and August 15 of each year.

Reference is made to the further provisions of this Note contained herein, which will for all purposes have the same effect as if set forth at this place.

A-1

IN WITNESS WHEREOF, the Company has caused this Note to be signed manually or by facsimile by one of its duly authorized officers.

Dated: August 19, 2011

A-2

Certificate of Authentication

This is one of the 3.750% Notes due 2016 referred to in the within-mentioned Indenture.

Dated: August 19, 2011

A-3

FLIR SYSTEMS, INC.

3.750% NOTE DUE 2016

1. Interest. FLIR Systems, Inc., an Oregon corporation, as issuer (the “Company”), promises to pay, until the principal hereof is paid or made available for payment, interest on the principal amount set forth on the face hereof at a rate of 3.750% per annum. Interest hereon will accrue from and including the most recent date to which interest has been paid or, if no interest has been paid, from and including August 19, 2011 to but excluding the date on which interest is paid. Interest shall be payable in arrears on March 1 and September 1 of each year, commencing March 1, 2012. Interest will be computed on the basis of a 360-day year comprised of twelve 30-day months. The Company shall pay interest on overdue principal and on overdue interest (to the full extent permitted by law) at the rate borne by the Notes.

2. Method of Payment. The Company will pay interest hereon (except defaulted interest) to the Persons who are registered Holders at the close of business on the February 15 and August 15 immediately preceding the interest payment date (whether or not a Business Day). Holders do not have to surrender Notes to a Paying Agent to collect principal payments. The Company will pay to the Paying Agent principal and interest in money of the United States of America that at the time of payment is legal tender for payment of public and private debts. If a Holder has given wire transfer instructions to the Company, the Company will pay, or cause to be paid by the Paying Agent, all principal (and premium, if any) and interest on that Holder’s Notes in accordance with those instructions. All other payments on the Notes will be made at the office or agency of the Paying Agent and Registrar unless the Company elects to make interest payments by check mailed to the Holders at their address set forth in the register of Holders.

3. Paying Agent and Registrar. Initially, U.S. Bank National Association (the “Trustee”) will act as a Paying Agent and Registrar. The Company may change any Paying Agent or Registrar without notice to the Holders. The Company or any of its Subsidiaries may act as Paying Agent or Registrar.

4. Indenture. This Note is one of the series designated on the face hereof. This Note is one of a duly authorized issue of securities of the Company issued and to be issued in one or more series under an Indenture, dated as of August 19, 2011 (the “Base Indenture”), between the Company and the Trustee, as supplemented by the First Supplemental Indenture, dated as of August 19, 2011, between the Company and the Trustee (the “Supplemental Indenture” and, together with the Base Indenture, as supplemented by the Supplemental Indenture, the “Indenture”). This is one of an issue of Notes of the Company issued, or to be issued, under the Indenture. The terms of the Notes include those stated in the Indenture and those made part of the Indenture by reference to the Trust Indenture Act of 1939 (15 U.S. Code §§ 77aaa-77bbbb), as amended from time to time (the “Trust Indenture Act”). The Notes are subject to all such terms, and Holders are referred to the Indenture and the Trust Indenture Act for a statement of them. Capitalized and certain other terms used herein and not otherwise defined have the meanings set forth in the Indenture.

5. Optional Redemption. The Notes of this series are subject to redemption at any time or from time to time, in whole or in part, at the Company’s option at a Redemption Price

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equal to the greater of (i) 100% of the principal amount of the Notes to be redeemed, and (ii) as determined by the Quotation Agent, the sum of the present values of the remaining scheduled payments of principal and interest in respect of the Notes to be redeemed (not including any interest accrued as of the Redemption Date) from the Redemption Date through the stated maturity of the Notes to be redeemed, in each case discounted to the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 45 basis points, plus accrued and unpaid interest on the Notes to be redeemed to the Redemption Date. The Company may provide in such notice that payment of such price and performance of the Company’s obligations with respect to such redemption or purchase may be performed by another Person. Any such notice may, at the Company’s discretion, be subject to the satisfaction of one or more conditions precedent.

Any notice to holders of Notes of a redemption pursuant to this paragraph 5 will include the appropriate calculation of the Redemption Price, but does not need to include the Redemption Price itself. The actual Redemption Price, calculated as described above, will be set forth in an Officers’ Certificate of the Company delivered to the Trustee no later than two Business Days prior to the Redemption Date.

6. Redemption Procedures. The Trustee will select Notes called for redemption in part pursuant to paragraph 5 on a pro rata basis or on as nearly a pro rata basis as is practicable (subject to procedures of the Depository); provided that Notes in principal amount of $2,000 or less shall be redeemed in whole and not in part. A new Note in principal amount equal to the unredeemed portion thereof will be issued in the name of the Holder thereof upon cancellation of the original Note, or in the case of Notes represented by a Global Security, the outstanding principal amount of such Global Security will be reduced by book-entry. Notes called for redemption pursuant to paragraph 5 become due on the Redemption Date. On and after the Redemption Date, interest stops accruing on Notes or portions of them called for redemption (unless there is a default in the payment thereof).

7. Notice of Redemption. Notices of redemption pursuant to paragraph 5 shall be mailed by first class mail at least 30 but not more than 60 days before the Redemption Date to each Holder of Notes to be redeemed at its registered address. If any Note is to be redeemed in part only, the notice of redemption that relates to such Note shall state the portion of the principal amount thereof to be redeemed.

8. Change of Control. Upon the occurrence of a Change of Control Triggering Event, unless all Notes have been called for redemption pursuant to paragraph 5, each Holder of Notes of this series shall have the right to require the Company to repurchase all or any part (equal to $2,000 or an integral multiple of $1,000 in excess thereof) of such Notes at an offer price in cash equal to the Change of Control Payment. The Change of Control Offer will be made in accordance with the terms specified in the Indenture.

9. Denominations, Transfer, Exchange. The Notes are in registered form without coupons in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. A Holder may transfer or exchange Notes in accordance with the Indenture. The Registrar may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and to pay to it any taxes and fees required by law or permitted by the Indenture.

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10. Persons Deemed Owners. The registered Holder of this Note may be treated as the owner of this Note for all purposes.

11. Unclaimed Money. If money for the payment of principal or interest remains unclaimed for two years, the Trustee or Paying Agent will pay the money back to the Company at its written request. After that, Holders entitled to the money must look to the Company for payment as general creditors unless an “abandoned property” law designates another Person.

12. Amendment, Waiver, Etc. The Company and the Trustee (if a party thereto) may, without the consent of the Holders of any outstanding Notes, amend or waive the Indenture or the Notes for certain specified purposes, including, among other things, curing ambiguities, defects or inconsistencies, maintaining the qualification of the Indenture under the Trust Indenture Act, providing for the assumption by a successor to the Company of its obligations under the Indenture and making any change that does not adversely affect the rights of any Holder in any material respect. Other amendments of the Indenture or the Notes may be made by the Company and the Trustee with the consent of the Holders of not less than a majority of the aggregate principal amount of the outstanding Notes, subject to certain exceptions requiring the consent of the Holders of the particular Notes to be affected.

13. Successor Corporation. When a successor corporation assumes all the obligations of its predecessor under the Notes and the Indenture and the transaction complies with the terms of Article Five of the Base Indenture, the predecessor corporation will, except as provided in Article Five of the Base Indenture, be released from those obligations.

14. Defaults and Remedies. Events of Default are set forth in the Indenture. Subject to certain limitations in the Indenture, if an Event of Default (other than an Event of Default specified in Sections 6.01(5) and 6.01(6) of the Base Indenture) occurs and is continuing, then, and in each and every such case, either the Trustee, by notice in writing to the Company, or the Holders of not less than 25% of the principal amount of the Notes then outstanding, by notice in writing to the Company and the Trustee, may, and the Trustee at the request of such Holders shall, declare due and payable, if not already due and payable, the principal of and any accrued and unpaid interest on all of the Notes; and upon any such declaration all such amounts upon such Notes shall become and be immediately due and payable, anything in the Indenture or in the Notes to the contrary notwithstanding. If an Event of Default specified in Sections 6.01(5) and 6.01(6) of the Base Indenture occurs, then the principal of and any accrued and unpaid interest on all of the Notes shall immediately become due and payable without any declaration or other act on the part of the Trustee or any Holder. Holders may not enforce the Indenture or the Notes except as provided in the Indenture. The Trustee may require indemnity satisfactory to it before it enforces the Indenture or the Notes. Subject to certain limitations, Holders of a majority in principal amount of the then outstanding Notes may direct the Trustee in its exercise of any trust or power, provided, that the Trustee will be entitled to refuse to follow any such direction that conflicts with law or the Indenture or that the Trustee determines in good faith is unduly prejudicial to the rights of other Holders or could, in reasonable likelihood, impose personal liability upon the Trustee, unless the Trustee is offered indemnity satisfactory to it. The Trustee may withhold from Holders notice of any continuing default (except a default in payment of principal, premium, if any, or interest on the Notes) if it determines that withholding notice is in their best interests.

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15. Trustee Dealings with Company. Subject to certain limitations imposed by the Trust Indenture Act, the Trustee, in its individual or any other capacity, may make loans to, accept deposits from, perform services for or otherwise deal with the Company or any Affiliate thereof, with the same rights it would have as if it were not Trustee.

16. No Recourse Against Others. No past, present or future director, officer, employee, incorporator, agent, member or stockholder or Affiliate of the Company, as such, shall have any liability for any obligations of the Company under the Notes, the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder of Notes by accepting a Note waives and releases all such liabilities. The waiver and release are part of the consideration for issuance of the Notes.

17. Discharge; Defeasance. The Company’s obligations pursuant to the Indenture will be discharged, except for obligations pursuant to certain sections thereof, subject to the terms of the Indenture, upon the payment of all the Notes or upon the irrevocable deposit with the Trustee of United States dollars or Government Obligations sufficient to pay when due principal of and interest on the Notes to maturity or redemption.

The Indenture contains provisions for defeasance at any time of (a) the entire indebtedness of the Company on this Note and (b) certain restrictive covenants and the related Events of Default, upon compliance by the Company with certain conditions set forth therein, which provisions apply to this Note.

18. Guarantee. As more fully set forth in the Base Indenture, the Company’s obligations under the Notes shall be guaranteed, to the extent permitted by law, by each Domestic Subsidiary of the Company required to execute a supplemental indenture in accordance with Sections 4.09 and 10.03 of the Base Indenture.

19. Authentication. This Note shall not be valid until the Trustee signs the certificate of authentication on the other side of this Security.

20. Governing Law. THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

21. Abbreviations. Customary abbreviations may be used in the name of a Holder or an assignee, such as: TEN COM (= tenants in common), TENANT (= tenants by the entireties), JT TEN (= joint tenants with right of survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts to Minors Act).

The Company will furnish to any Holder upon written request and without charge a copy of the Indenture. Requests may be made to:

FLIR Systems, Inc.

27700 SW Parkway Avenue

Wilsonville, Oregon 97070

Attn: General Counsel

Tel: (503)  ###-###-####

Fax: (503)  ###-###-####

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ASSIGNMENT

I or we assign and transfer this Note to:

(Insert assignee’s social security or tax I.D. number)

(Print or type name, address and zip code of assignee)

and irrevocably appoint:

Agent to transfer this Note on the books of the Company. The Agent may substitute another to act for him.

SIGNATURE GUARANTEE

Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Registrar, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.

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