Keystone Technologies Linear LED Troffer FutureFit Kits available at Pro Lighting are rated to provide more than 90,000 hours of light life. Convert your present fixtures into linear LED systems that provide substantially more energy efficiency, resulting in significant savings on future utility bills. Retrofit kits install quickly and easily with the required Keystone driver, LED modules and mounting accessories. The linear LED FutureFit Kits are offered in either 36w or 44w lamps, with a voltage of 120-277 VAC and three different options of color tone: neutral white, cool white or daylight. Choose from 3500K, 4000K or 5000K color temperatures. These dimmable lights have a beam angle of 120 degrees, with UL listings for both damp location and dry location. They allow the user to control the level of light to save even more on electricity bills. These Keystone kits, with lumens ranging from 3,820 to 5,000, come with a manufacturer's warranty good for 10 years.