The Green Creative 40670 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 warm white color temperature of 3500K, and a rated lifetime of 50,000 hours. This lamp is an ideal T12 replacement as well since it uses the same tombstones lampholders that a T8 does. 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.