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. The Precision Lighting 101018 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 cool white color temperature of 4000K, and a rated lifetime of 40,000 hours. This T8 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.