The Green Creative 40673 T8 Ultra LED tube lamp provides exceptional LED lighting with reduced energy and maintenance costs. Measuring four feet in length and operating at 18 watts, this lamp has a particularly wide beam spread of 240 degrees, a halogen white color temperature of 3000K, and a rated lifetime of 50,000 hours. This GC lamp also does not require a ballast to work and offers a built-in universal line voltage driver, making it a top-of-the-line replacement for standard fluorescent lamps. To be installed by licensed electrician only. Requires non-shunted lamp holders (tombstones). See part no. SOCK-L13051U. Do not use with dimmers.This LED T8 tube is not intended for use in water-tight or vapor-tight lighting fixtures which are described as "totally enclosed fixtures" on tube packaging. This LED T8 tube is suitable for use in common lensed troffer applications.