Satco's 40 watt T8 LED 8 foot Linear Type B ballast bypass commercial linear replacement lamp offers long LED life, packs 5500 powerful lumens of bright, superior quality light, and is DLC certified energy efficient. Double ended wiring for convenience, the white bulb features a single pin base and delivers exceptional illumination. At a temperature of 5000 kelvins, this lamp provides 50,000 hours of natural light.