Halco Lighting Technologies 4 ft. 13-Watt T8 Dimmable LED Linear Light Bulb Type A Daylight 5000K (10-Pack)Halco's Direct T8 Series use 59% less energy than a standard Fluorescent T8 and lasts up to 66% longer. No rewiring of existing luminaire necessary. Operates on instant start, programmed start and dimming ballasts. The ProLED Direct T8 Series produces greater than 138 LPW using only 13 Watt of energy. Average life of 50,000 hour resulting in lower maintenance costs. Rated for totally enclosed fixtures. Brightness: 1800 Lumens Lifetime: 50,000 hours