Document:

<PAGE>
                            ASSIGNMENT AGREEMENT AND
                   AMENDMENT TO INCREASE AGGREGATE COMMITMENT

         This Assignment Agreement and Amendment to Increase Aggregate
Commitment (this "Agreement") by and among Bank One, NA and Wachovia Bank, N.A.
(each an "Assignor"), Dresdner Bank AG New York & Grand Cayman Branches (the
"Assignee" or the "New Lender"), Acuity Brands, Inc., Acuity Lighting Group,
Inc. and Acuity Specialty Products Group, Inc. (collectively, the "Borrowers"),
and Bank One, NA, in its capacity as Administrative Agent under the Credit
Agreement (as defined below) is dated as of May 14, 2002. The parties hereto
agree as follows:

1.       PRELIMINARY STATEMENT. Each Assignor is a party to a Credit Agreement
         (which, as it may be amended, modified, renewed or extended from time
         to time is herein called the "Credit Agreement") described in Item 1
         of Schedule 1 attached hereto ("Schedule 1"). Capitalized terms used
         herein and not otherwise defined herein shall have the meanings
         attributed to them in the Credit Agreement.

2.       ASSIGNMENT AND ASSUMPTION. Each Assignor hereby sells and assigns to
         the Assignee, and the Assignee hereby purchases and assumes from each
         Assignor, an interest in and to each Assignor's rights and obligations
         under the Credit Agreement and the other Loan Documents, such that
         after giving effect to such assignment the Assignee shall have
         purchased from each Assignor pursuant to this Agreement the percentage
         interest specified in Item 3 of Schedule 1 of all of such Assignor's
         outstanding rights and obligations under the Credit Agreement and the
         other Loan Documents relating to the facilities listed in Item 3 of
         Schedule 1. The aggregate amount of the Commitment (or Outstanding
         Credit Exposure, if the applicable Commitment has been terminated)
         purchased by the Assignee hereunder is set forth in Item 4(a) of
         Schedule 1.

3.       EFFECTIVE DATE. The effective date of this Agreement (the "Effective
         Date") shall be the later of the date specified in Item 5 of Schedule
         1 or two (2) Business Days (or such shorter period agreed to by the
         Administrative Agent) after this Agreement, together with any consents
         required under the Credit Agreement, are delivered to the
         Administrative Agent. In no event will the Effective Date occur if the
         payments required to be made by the Assignee to the Assignors on the
         Effective Date are not made on the proposed Effective Date.

4.       PAYMENT OBLIGATIONS. In consideration for the sale and assignment of
         the Commitment and/or Outstanding Credit Exposure hereunder, the
         Assignee shall pay each Assignor, on the Effective Date, the amount
         agreed to by the Assignors and the Assignee. On and after the
         Effective Date, the Assignee shall be entitled to receive from the
         Administrative Agent all payments of principal, interest and fees with
         respect to the interest assigned hereby. The Assignee will promptly
         remit to the applicable Assignor any interest on Outstanding Credit
         Exposure and fees received from the Administrative Agent which relate
         to the portion of the Commitment or Outstanding Credit Exposure
         assigned to the Assignee by such Assignor hereunder for periods prior
         to the Effective Date and not previously paid by the Assignee to such
         Assignor. In the event that any party hereto receives any payment to
         which any other party hereto is entitled under this

<PAGE>

         Agreement, then the party receiving such amount shall promptly remit
         it to the applicable party hereto.

5.       RECORDATION FEE. The recordation fee required to be paid to the
         Administrative Agent in connection with this Agreement is hereby
         waived.

6.       REPRESENTATIONS OF EACH ASSIGNOR; LIMITATIONS ON THE ASSIGNOR'S
         LIABILITY. Each Assignor, individually and not jointly, represents and
         warrants that (i) it is the legal and beneficial owner of the interest
         being assigned by it hereunder, (ii) such interest is free and clear
         of any adverse claim created by such Assignor and (iii) the execution
         and delivery of this Agreement by such Assignor is duly authorized. It
         is understood and agreed that the assignment and assumption hereunder
         are made without recourse to any Assignor and that no Assignor makes
         any other representation or warranty of any kind to the Assignee.
         Neither any Assignor nor any of their respective officers, directors,
         employees, agents or attorneys shall be responsible for (i) the due
         execution, legality, validity, enforceability, genuineness,
         sufficiency or collectability of any Loan Document, including, without
         limitation, documents granting such Assignor and the other Lenders a
         security interest in assets of the Borrowers or any guarantor, (ii)
         any representation, warranty or statement made in or in connection
         with any of the Loan Documents, (iii) the financial condition or
         creditworthiness of the Borrowers or any guarantor, (iv) the
         performance of or compliance with any of the terms or provisions of
         any of the Loan Documents, (v) inspecting any of the property, books
         or records of the Borrowers, (vi) the validity, enforceability,
         perfection, priority, condition, value or sufficiency of any
         collateral securing or purporting to secure the Loans or (vii) any
         mistake, error of judgment, or action taken or omitted to be taken in
         connection with the Loans or the Loan Documents.

7.       REPRESENTATIONS AND UNDERTAKINGS OF THE ASSIGNEE. The Assignee (i)
         confirms that it has received a copy of the Credit Agreement, together
         with copies of the financial statements requested by the Assignee and
         such other documents and information as it has deemed appropriate to
         make its own credit analysis and decision to enter into this
         Agreement, (ii) agrees that it will, independently and without
         reliance upon any Agent, the Arranger, any Assignor or any other
         Lender and based on such documents and information at it shall deem
         appropriate at the time, continue to make its own credit decisions in
         taking or not taking action under the Loan Documents, (iii) appoints
         and authorizes each Agent to take such action as agent on its behalf
         and to exercise such powers under the Loan Documents as are delegated
         to such Agent by the terms thereof, together with such powers as are
         reasonably incidental thereto, (iv) confirms that the execution and
         delivery of this Agreement by the Assignee is duly authorized, (v)
         agrees that it will perform in accordance with their terms all of the
         obligations which by the terms of the Loan Documents are required to
         be performed by it as a Lender, (vi) agrees that its payment
         instructions and notice instructions are as set forth in the
         attachment to Schedule 1, (vii) confirms that none of the funds,
         monies, assets or other consideration being used to make the purchase
         and assumption hereunder are "plan assets" as defined under ERISA and
         that its rights, benefits and interests in and under the Loan
         Documents will not be "plan assets" under ERISA, (viii) agrees to
         indemnify and hold each Assignor harmless against all losses, costs
         and expenses (including, but not limited to, reasonable

                                       2
<PAGE>

         attorneys' fees) and liabilities incurred by such Assignor in
         connection with or arising in any manner from the Assignee's
         non-performance of the obligations assumed under this Agreement, and
         (ix) if applicable, attaches the forms prescribed by the Internal
         Revenue Service of the United States certifying that the Assignee is
         entitled to receive payments under the Loan Documents without
         deduction or withholding of any United States federal income taxes.

8.       INCREASE OF AGGREGATE COMMITMENT; REALLOCATION OF OUTSTANDING LOANS.

                  (A)      Effective as of the Effective Date and subject to
         the Administrative Agent's receipt of duly executed copies of this
         Agreement from each of the parties hereto, the Credit Agreement is
         hereby amended pursuant to Section 2.24 thereof to increase the
         Aggregate Commitment to $105,000,000, and the Commitment of the New
         Lender (after giving effect to such increase of the Aggregate
         Commitment and the assignments from the Assignors to the Assignee
         contemplated in this Agreement) shall be $12,500,000. From and after
         the Effective Date, the New Lender shall be deemed to be a Lender for
         all purposes under the Credit Agreement.

                  (B)      On the Effective Date, the Administrative Agent
         shall administer the reallocation of any outstanding Loans ratably
         among the Lenders after giving effect to the increase in the Aggregate
         Commitment contemplated by this Agreement. In connection with such
         reallocation, on the Effective Date, (a) each Lender party to the
         Credit Agreement prior to the effectiveness of this Agreement (each an
         "Existing Lender") shall be deemed to sell, grant, assign and convey
         to the New Lender, without recourse, warranty, or representation of
         any kind, except as specifically provided herein, an undivided
         percentage in such Existing Lender's right, title and interest in and
         to its outstanding Loans in the respective dollar amounts and
         percentages necessary so that, from and after such sale, each such
         Existing Lender's outstanding Loans shall equal such Existing Lender's
         Pro Rata Share (calculated after giving effect to the increase in the
         Aggregate Commitment contemplated by this Agreement) of the
         outstanding Loans, and (b) the New Lender hereby purchases and accepts
         such grant, assignment and conveyance from the Existing Lenders. The
         New Lender hereby agrees that its respective purchase price for the
         portion of the outstanding Loans purchased hereby shall equal the
         respective dollar amount necessary so that, from and after such
         payments, the New Lender's outstanding Loans shall equal the New
         Lender's Pro Rata Share (calculated after giving effect to the
         increase in the Aggregate Commitment contemplated by this Agreement)
         of the outstanding Loans. The New Lender shall pay such amount on the
         Effective Date by wire transfer of immediately available funds to the
         Administrative Agent, for the account of the Existing Lenders. The New
         Lender hereby acknowledges and agrees that the New Lender has entered
         into this Agreement and the Credit Agreement on the basis of its own
         independent investigation and has not relied upon, and will not rely
         upon, any explicit or implicit written or oral representation,
         warranty or other statement of the Lenders or the Administrative Agent
         concerning the authorization, execution, legality, validity,
         effectiveness, genuineness, enforceability or sufficiency of this
         Agreement or the other Loan Documents.

                                       3
<PAGE>

9.       REPRESENTATIONS AND WARRANTIES OF THE BORROWERS. The Borrowers hereby
         represent and warrant that (i) this Agreement and the Credit Agreement
         as previously executed and as modified hereby, constitute legal, valid
         and binding obligations of the Borrowers and are enforceable against
         the Borrowers in accordance with their terms and (ii) no Default or
         Unmatured Default has occurred and is continuing. Upon the
         effectiveness of this Agreement and after giving effect hereto, the
         Borrowers hereby reaffirm all covenants, representations and
         warranties made in the Credit Agreement as modified hereby, and agree
         that all such covenants, representations and warranties shall be
         deemed to have been remade as of the Effective Date (except to the
         extent any such representation or warranty is stated to relate solely
         to an earlier date, in which case such representation or warranty
         shall have been true and correct in all material respects on and as of
         such earlier date).

10.      GOVERNING LAW. This Agreement shall be governed by the internal law,
         including 735 ILCS 105/5-1 et seq., but otherwise without regard to
         the law of conflicts, of the State of Illinois.

11.      NOTICES. Notices shall be given under this Agreement in the manner set
         forth in the Credit Agreement. For the purpose hereof, the addresses
         of the parties hereto (until notice of a change is delivered) shall be
         the addresses set forth in the Credit Agreement, and, in the case of
         the Assignee, on the attachment to Schedule 1 hereto.

12.      COUNTERPARTS; DELIVERY BY FACSIMILE. This Agreement may be executed in
         counterparts. Transmission by facsimile of an executed counterpart of
         this Agreement shall be deemed to constitute due and sufficient
         delivery of such counterpart and such facsimile shall be deemed to be
         an original counterpart of this Agreement.

         IN WITNESS WHEREOF, the duly authorized officers of the parties hereto
have executed this Agreement by executing Schedule 1 hereto as of the date
first above written.

                                       4
<PAGE>

                                   SCHEDULE I
                                  to Agreement

1.       Description and Date of Credit Agreement: 364-Day Revolving Credit
Agreement, dated April 8, 2002, among Acuity Brands, Inc., a Delaware
corporation (the "Company"), the Subsidiary Borrowers from time to time parties
thereto, the Lenders named therein, and Bank One, NA (Main Office -- Chicago),
as the Administrative Agent, as the same may be amended, restated, supplemented
or otherwise modified from time to time

2.       Date of Agreement: May 14, 2002

3.       Amounts (As of Date of Item 2 above):

<TABLE>
<S>      <C>      <C>                                 <C>                         <C>
         a.       Assignee's percentage of the        Percentage purchased by     Total percentage of
                  Aggregate Commitment                the Assignee under the      Assignee (after giving
                                                      Agreement (before giving    effect to the assignments
                                                      effect to the increase in   and increase in the
                                                      the Aggregate Commitment    Aggregate Commitment contemplated
                                                      by Section 8 contemplated   by the of the Agreement)
                                                      Agreement)

                                                      9.7560976%                  11.9047619%

         B.       Amount of the Aggregate             Amount Purchased From Bank  Amount Purchased From
                  Commitment purchased under the      One, NA                     Wachovia Bank, N.A.
                  Agreement

                                                      $5,000,000                  $5,000,000

4.       Assignee's Commitment:

                                                      After giving effect to the  After giving effect to the
                                                      assignments contemplated    assignments and increase
                                                      by the Agreement            in the Aggregate
                                                                                  Commitment contemplated by
                                                                                  the Agreement

                                                      $10,000,000                 $12,500,000

5.       Proposed Effective Date:                     May 14, 2002

6.       Non-standard Recordation Fee
         Arrangement                                  The recordation fee has
                                                      been waived.

</TABLE>

<PAGE>

Accepted and Agreed:

BANK ONE, NA, as an Assignor                 DRESDNER BANK AG NEW YORK & GRAND
                                             CAYMAN BRANCHES, as the Assignee

By: /s/ Timothy J. King                      By: /s/ Frank Fiorito
   ------------------------------               -------------------------------
Title: Director                              Title: Director

WACHOVIA BANK, N.A.,
as an Assignor

By: /s/ Karin E. Reel
   ------------------------------
Title: Vice President

ACCEPTED AND CONSENTED TO                    ACCEPTED AND CONSENTED TO

BY:                                          BY:
   ------------------------------               -------------------------------

ACUITY BRANDS, INC.                          BANK ONE, NA (MAIN OFFICE --
                                             CHICAGO), as Administrative Agent

By:  /s/ Vernon J. Nagel                     By: /s/ Timothy J. King
   ------------------------------               -------------------------------
Title: EVP & CFO                             Title: Director

ACUITY LIGHTING GROUP, INC.

By:  /s/ Vernon J. Nagel
   ------------------------------
Title: EVP & CFO

ACUITY SPECIALTY PRODUCTS
GROUP, INC.

By:  /s/ Vernon J. Nagel
   ------------------------------
Title: EVP & CFO

2
<PAGE>

  Attachment to SCHEDULE 1 to ASSIGNMENT AGREEMENT AND AMENDMENT TO INCREASE
                             AGGREGATE COMMITMENT

             ASSIGNEE'S ADMINISTRATIVE INFORMATION SHEET (ATTACHED)

<PAGE>

                              BANK ONE INFORMATION

    Assignee will be called promptly upon receipt of the signed agreement.

INITIAL FUNDING CONTACT:               SUBSEQUENT OPERATIONS CONTACT:
-----------------------                -----------------------------
Name:                                  Name:
Telephone No.:  (312)                  Telephone No.:  (312)
Fax No.:  (312)                        Fax No.:  (312)
                                       Bank One Telex No.:  190201
                                       (Answerback:   FNBC UT)

INITIAL FUNDING STANDARDS:
-------------------------

Libor - Fund 2 days after rates
are set.

BANK ONE WIRE INSTRUCTIONS:            Bank One, NA, ABA # 071000013
--------------------------
                                       LS2 Incoming Account # 481152860000
                                       Ref:  Acuity Brands, Inc.

ADDRESS FOR NOTICES FOR BANK ONE:      1 Bank One Plaza, Chicago, IL  60670
--------------------------------
                                       Attn: Agency Compliance Division,
                                       Suite IL1-0353
                                       Fax No. (312) 732-2038 or (312) 732-4339

2<PAGE>
                            ASSIGNMENT AGREEMENT AND
                   AMENDMENT TO INCREASE AGGREGATE COMMITMENT

         This Assignment Agreement and Amendment to Increase Aggregate
Commitment (this "Agreement") by and among Bank One, NA and Wachovia Bank, N.A.
(each an "Assignor"), Dresdner Bank AG New York & Grand Cayman Branches (the
"Assignee" or the "New Lender"), Acuity Brands, Inc., Acuity Lighting Group,
Inc. and Acuity Specialty Products Group, Inc. (collectively, the "Borrowers"),
and Bank One, NA, in its capacity as Administrative Agent under the Credit
Agreement (as defined below) is dated as of May 14, 2002. The parties hereto
agree as follows:

1.       PRELIMINARY STATEMENT. Each Assignor is a party to a Credit Agreement
         (which, as it may be amended, modified, renewed or extended from time
         to time is herein called the "Credit Agreement") described in Item 1
         of Schedule 1 attached hereto ("Schedule 1"). Capitalized terms used
         herein and not otherwise defined herein shall have the meanings
         attributed to them in the Credit Agreement.

2.       ASSIGNMENT AND ASSUMPTION. Each Assignor hereby sells and assigns to
         the Assignee, and the Assignee hereby purchases and assumes from each
         Assignor, an interest in and to each Assignor's rights and obligations
         under the Credit Agreement and the other Loan Documents, such that
         after giving effect to such assignment the Assignee shall have
         purchased from each Assignor pursuant to this Agreement the percentage
         interest specified in Item 3 of Schedule 1 of all of such Assignor's
         outstanding rights and obligations under the Credit Agreement and the
         other Loan Documents relating to the facilities listed in Item 3 of
         Schedule 1. The aggregate amount of the Commitment (or Outstanding
         Credit Exposure, if the applicable Commitment has been terminated)
         purchased by the Assignee hereunder is set forth in Item 4(a) of
         Schedule 1.

3.       EFFECTIVE DATE. The effective date of this Agreement (the "Effective
         Date") shall be the later of the date specified in Item 5 of Schedule
         1 or two (2) Business Days (or such shorter period agreed to by the
         Administrative Agent) after this Agreement, together with any consents
         required under the Credit Agreement, are delivered to the
         Administrative Agent. In no event will the Effective Date occur if the
         payments required to be made by the Assignee to the Assignors on the
         Effective Date are not made on the proposed Effective Date.

4.       PAYMENT OBLIGATIONS. In consideration for the sale and assignment of
         the Commitment and/or Outstanding Credit Exposure hereunder, the
         Assignee shall pay each Assignor, on the Effective Date, the amount
         agreed to by the Assignors and the Assignee. On and after the
         Effective Date, the Assignee shall be entitled to receive from the
         Administrative Agent all payments of principal, interest and fees with
         respect to the interest assigned hereby. The Assignee will promptly
         remit to the applicable Assignor any interest on Outstanding Credit
         Exposure and fees received from the Administrative Agent which relate
         to the portion of the Commitment or Outstanding Credit Exposure
         assigned to the Assignee by such Assignor hereunder for periods prior
         to the Effective Date and not previously paid by the Assignee to such
         Assignor. In the event that any party hereto receives any payment to
         which any other party hereto is entitled under this

<PAGE>

         Agreement, then the party receiving such amount shall promptly remit
         it to the applicable party hereto.

5.       RECORDATION FEE. The recordation fee required to be paid to the
         Administrative Agent in connection with this Agreement is hereby
         waived.

6.       REPRESENTATIONS OF EACH ASSIGNOR; LIMITATIONS ON THE ASSIGNOR'S
         LIABILITY. Each Assignor, individually and not jointly, represents and
         warrants that (i) it is the legal and beneficial owner of the interest
         being assigned by it hereunder, (ii) such interest is free and clear
         of any adverse claim created by such Assignor and (iii) the execution
         and delivery of this Agreement by such Assignor is duly authorized. It
         is understood and agreed that the assignment and assumption hereunder
         are made without recourse to any Assignor and that no Assignor makes
         any other representation or warranty of any kind to the Assignee.
         Neither any Assignor nor any of their respective officers, directors,
         employees, agents or attorneys shall be responsible for (i) the due
         execution, legality, validity, enforceability, genuineness,
         sufficiency or collectability of any Loan Document, including, without
         limitation, documents granting such Assignor and the other Lenders a
         security interest in assets of the Borrowers or any guarantor, (ii)
         any representation, warranty or statement made in or in connection
         with any of the Loan Documents, (iii) the financial condition or
         creditworthiness of the Borrowers or any guarantor, (iv) the
         performance of or compliance with any of the terms or provisions of
         any of the Loan Documents, (v) inspecting any of the property, books
         or records of the Borrowers, (vi) the validity, enforceability,
         perfection, priority, condition, value or sufficiency of any
         collateral securing or purporting to secure the Loans or (vii) any
         mistake, error of judgment, or action taken or omitted to be taken in
         connection with the Loans or the Loan Documents.

7.       REPRESENTATIONS AND UNDERTAKINGS OF THE ASSIGNEE. The Assignee (i)
         confirms that it has received a copy of the Credit Agreement, together
         with copies of the financial statements requested by the Assignee and
         such other documents and information as it has deemed appropriate to
         make its own credit analysis and decision to enter into this
         Agreement, (ii) agrees that it will, independently and without
         reliance upon any Agent, the Arranger, any Assignor or any other
         Lender and based on such documents and information at it shall deem
         appropriate at the time, continue to make its own credit decisions in
         taking or not taking action under the Loan Documents, (iii) appoints
         and authorizes each Agent to take such action as agent on its behalf
         and to exercise such powers under the Loan Documents as are delegated
         to such Agent by the terms thereof, together with such powers as are
         reasonably incidental thereto, (iv) confirms that the execution and
         delivery of this Agreement by the Assignee is duly authorized, (v)
         agrees that it will perform in accordance with their terms all of the
         obligations which by the terms of the Loan Documents are required to
         be performed by it as a Lender, (vi) agrees that its payment
         instructions and notice instructions are as set forth in the
         attachment to Schedule 1, (vii) confirms that none of the funds,
         monies, assets or other consideration being used to make the purchase
         and assumption hereunder are "plan assets" as defined under ERISA and
         that its rights, benefits and interests in and under the Loan
         Documents will not be "plan assets" under ERISA, (viii) agrees to
         indemnify and hold each Assignor harmless against all losses, costs
         and expenses (including, but not limited to, reasonable

                                       2
<PAGE>

         attorneys' fees) and liabilities incurred by such Assignor in
         connection with or arising in any manner from the Assignee's
         non-performance of the obligations assumed under this Agreement, and
         (ix) if applicable, attaches the forms prescribed by the Internal
         Revenue Service of the United States certifying that the Assignee is
         entitled to receive payments under the Loan Documents without
         deduction or withholding of any United States federal income taxes.

8.       INCREASE OF AGGREGATE COMMITMENT; REALLOCATION OF OUTSTANDING LOANS.

                  (A)      Effective as of the Effective Date and subject to
         the Administrative Agent's receipt of duly executed copies of this
         Agreement from each of the parties hereto, the Credit Agreement is
         hereby amended pursuant to Section 2.23 thereof to increase the
         Aggregate Commitment to $105,000,000, and the Commitment of the New
         Lender (after giving effect to such increase of the Aggregate
         Commitment and the assignments from the Assignors to the Assignee
         contemplated in this Agreement) shall be $12,500,000. From and after
         the Effective Date, the New Lender shall be deemed to be a Lender for
         all purposes under the Credit Agreement.

                  (B)      On the Effective Date, the Administrative Agent
         shall administer the reallocation of any outstanding Loans ratably
         among the Lenders after giving effect to the increase in the Aggregate
         Commitment contemplated by this Agreement. In connection with such
         reallocation, on the Effective Date, (a) each Lender party to the
         Credit Agreement prior to the effectiveness of this Agreement (each an
         "Existing Lender") shall be deemed to sell, grant, assign and convey
         to the New Lender, without recourse, warranty, or representation of
         any kind, except as specifically provided herein, an undivided
         percentage in such Existing Lender's right, title and interest in and
         to its outstanding Loans in the respective dollar amounts and
         percentages necessary so that, from and after such sale, each such
         Existing Lender's outstanding Loans shall equal such Existing Lender's
         Pro Rata Share (calculated after giving effect to the increase in the
         Aggregate Commitment contemplated by this Agreement) of the
         outstanding Loans, and (b) the New Lender hereby purchases and accepts
         such grant, assignment and conveyance from the Existing Lenders. The
         New Lender hereby agrees that its respective purchase price for the
         portion of the outstanding Loans purchased hereby shall equal the
         respective dollar amount necessary so that, from and after such
         payments, the New Lender's outstanding Loans shall equal the New
         Lender's Pro Rata Share (calculated after giving effect to the
         increase in the Aggregate Commitment contemplated by this Agreement)
         of the outstanding Loans. The New Lender shall pay such amount on the
         Effective Date by wire transfer of immediately available funds to the
         Administrative Agent, for the account of the Existing Lenders. The New
         Lender hereby acknowledges and agrees that the New Lender has entered
         into this Agreement and the Credit Agreement on the basis of its own
         independent investigation and has not relied upon, and will not rely
         upon, any explicit or implicit written or oral representation,
         warranty or other statement of the Lenders or the Administrative Agent
         concerning the authorization, execution, legality, validity,
         effectiveness, genuineness, enforceability or sufficiency of this
         Agreement or the other Loan Documents.

                                       3
<PAGE>
9.       REPRESENTATIONS AND WARRANTIES OF THE BORROWERS. The Borrowers hereby
         represent and warrant that (i) this Agreement and the Credit Agreement
         as previously executed and as modified hereby, constitute legal, valid
         and binding obligations of the Borrowers and are enforceable against
         the Borrowers in accordance with their terms and (ii) no Default or
         Unmatured Default has occurred and is continuing. Upon the
         effectiveness of this Agreement and after giving effect hereto, the
         Borrowers hereby reaffirm all covenants, representations and
         warranties made in the Credit Agreement as modified hereby, and agree
         that all such covenants, representations and warranties shall be
         deemed to have been remade as of the Effective Date (except to the
         extent any such representation or warranty is stated to relate solely
         to an earlier date, in which case such representation or warranty
         shall have been true and correct in all material respects on and as of
         such earlier date).

10.      GOVERNING LAW. This Agreement shall be governed by the internal law,
         including 735 ILCS 105/5-1 et seq., but otherwise without regard to
         the law of conflicts, of the State of Illinois.

11.      NOTICES. Notices shall be given under this Agreement in the manner set
         forth in the Credit Agreement. For the purpose hereof, the addresses
         of the parties hereto (until notice of a change is delivered) shall be
         the addresses set forth in the Credit Agreement, and, in the case of
         the Assignee, on the attachment to Schedule 1 hereto.

12.      COUNTERPARTS; DELIVERY BY FACSIMILE. This Agreement may be executed in
         counterparts. Transmission by facsimile of an executed counterpart of
         this Agreement shall be deemed to constitute due and sufficient
         delivery of such counterpart and such facsimile shall be deemed to be
         an original counterpart of this Agreement.

         IN WITNESS WHEREOF, the duly authorized officers of the parties hereto
have executed this Agreement by executing Schedule 1 hereto as of the date
first above written.

                                       4
<PAGE>

                                   SCHEDULE I
                                  to Agreement

1.       Description and Date of Credit Agreement: 3-Year Revolving Credit
Agreement, dated April 8, 2002, among Acuity Brands, Inc., a Delaware
corporation (the "Company"), the Subsidiary Borrowers from time to time parties
thereto, the Lenders named therein, and Bank One, NA (Main Office -- Chicago),
as the Administrative Agent, as the same may be amended, restated, supplemented
or otherwise modified from time to time

2.       Date of Agreement:  May 14, 2002

3.       Amounts (As of Date of Item 2 above):

<TABLE>
<S>     <C>       <C>                              <C>                          <C>
        a.        Assignee's percentage of the     Percentage purchased by      Total percentage of
                  Aggregate Commitment             the Assignee under the       Assignee (after giving
                                                   Agreement (before giving     effect to the assignments
                                                   effect to the increase in    and increase in the
                                                   the Aggregate Commitment     Aggregate Commitment
                                                   contemplated by Section 8    contemplated by the
                                                   of the Agreement)            Agreement)

                                                   9.7560976%                   11.9047619%

        B.        Amount of the Aggregate          Amount Purchased From Bank   Amount Purchased From
                  Commitment purchased under       One, NA                      Wachovia Bank, N.A.
                  the Agreement
                                                   $5,000,000                   $5,000,000

4.       Assignee's Commitment:                    After giving effect to the   After giving effect to the
                                                   assignments contemplated     assignments and increase
                                                   by the Agreement             in the Aggregate
                                                                                Commitment contemplated by
                                                                                the Agreement

                                                   $10,000,000                  $12,500,000

5.       Proposed Effective Date:                  May 14, 2002

6.       Non-standard Recordation Fee
         Arrangement                               The recordation fee has
                                                   been waived.
</TABLE>

<PAGE>

Accepted and Agreed:

BANK ONE, NA, as an Assignor                 DRESDNER BANK AG NEW YORK & GRAND
                                             CAYMAN BRANCHES, as the Assignee

By: /s/ Timothy J. King                      By: /s/ Frank Fiorito
   ------------------------------               -------------------------------
Title: Director                              Title:

WACHOVIA BANK, N.A., as an Assignor

By: /s/ Karin E. Reel
   ------------------------------
Title: Vice President

ACCEPTED AND CONSENTED TO                    ACCEPTED AND CONSENTED TO

BY:                                          BY:
   ------------------------------               -------------------------------

ACUITY BRANDS, INC.                          BANK ONE, NA (MAIN OFFICE --
                                             CHICAGO), as Administrative Agent

By:  /s/ Vernon J. Nagel                     By: /s/ Timothy J. King
   ------------------------------               -------------------------------
Title: EVP & CFO                             Title: Director

ACUITY LIGHTING GROUP, INC.

By:  /s/ Vernon J. Nagel
   ------------------------------
Title: EVP & CFO

ACUITY SPECIALTY PRODUCTS GROUP, INC.

By:  /s/ Vernon J. Nagel
   ------------------------------
Title: EVP & CFO

2
<PAGE>

  Attachment to SCHEDULE 1 to ASSIGNMENT AGREEMENT AND AMENDMENT TO INCREASE
                             AGGREGATE COMMITMENT

             ASSIGNEE'S ADMINISTRATIVE INFORMATION SHEET (ATTACHED)

<PAGE>

                              BANK ONE INFORMATION

    Assignee will be called promptly upon receipt of the signed agreement.

INITIAL FUNDING CONTACT:               SUBSEQUENT OPERATIONS CONTACT:
-----------------------                -----------------------------
Name:                                  Name:
Telephone No.:  (312)                  Telephone No.:  (312)
Fax No.:  (312)                        Fax No.:  (312)
                                       Bank One Telex No.:  190201
                                       (Answerback:   FNBC UT)

INITIAL FUNDING STANDARDS:
-------------------------

Libor - Fund 2 days after rates
are set.

BANK ONE WIRE INSTRUCTIONS:            Bank One, NA, ABA # 071000013
--------------------------
                                       LS2 Incoming Account # 481152860000
                                       Ref:  Acuity Brands, Inc.

ADDRESS FOR NOTICES FOR BANK ONE:      1 Bank One Plaza, Chicago, IL  60670
--------------------------------
                                       Attn: Agency Compliance Division,
                                       Suite IL1-0353
                                       Fax No. (312) 732-2038 or (312) 732-4339

2

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