ACUITY BRANDS, INC. LONG-TERM INCENTIVE PLAN AMENDMENT NO. 1 TO STOCK OPTION AGREEMENT FOR NONEMPLOYEE DIRECTOR

Exhibit 99.1

ACUITY BRANDS, INC.

LONG-TERM INCENTIVE PLAN

AMENDMENT NO. 1

TO

STOCK OPTION AGREEMENT

FOR NONEMPLOYEE DIRECTOR

THIS AMENDMENT, made as of the 25th day of October, 2006 by and between ACUITY BRANDS, INC., a Delaware Corporation, (the “Company”) and Jay M. Davis (“Optionee”).

W • I • T • N • E • S • S • E • T • H      T • H • A • T:

WHEREAS, the Company maintains the Acuity Brands, Inc. 2001 Nonemployee Directors’ Stock Option Plan (the “Plan”), under which Optionee has received one or more Stock Option Awards under the Plan; and

WHEREAS, the Company granted to Optionee an Option for 1,500 Shares of Company Common Stock, subject to, and in accordance with, the terms and conditions set forth in the Stock Option Agreemen