The PLT 101177 T8 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 40,000 hours. This PLT 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.