Green Ballast, Inc. announced that Healthcare Trust of America, Inc. has completed a lighting retrofit equipped with Green Ballast's patented daylight harvesting fluorescent light ballasts for a Fortune 500 pharmaceutical tenant in Lenox Office Park, a premier seven building 72 acre office park in Memphis, Tennessee. GBLL's ballast is a direct replacement for the existing standard ballast and adjusts power consumption for each lighting fixture, while measuring and harvesting available daylight to calculate and provide only the amount of needed electricity for proper lighting. It is a plug and play solution and has controls within each ballast, providing simple and efficient installation and ongoing maintenance.