The Eiko 00973 F54T5/HO/835/ES fluorescent lamp is a cost-effective and environmentally-friendly light source. Using only 49 watts, this high output lamp produces 4,900 lumens when used with a compatible programmed start ballast. Premium 800 series phosphors ensure a high CRI and color accuracy with a neutral white color temperature of 3500K. The long-life bulb lasts 35,000 hours when used in 12-hour starts. Sold in a case of 25.