This TCP 28968H27750K 289 series SpringLamp CFL features Amalgam technology which provides cooler operating temperatures for consistent performance in any position. Operating at 277 volts, this bulb fits fixtures with a mogul (E39) base socket. This eco-friendly bulb produces a 5000K full spectrum light temperature at 68 watts. With a 10,000 hour life rating, these bulbs are replaced less often than a 300-watt incandescent, making them ideal for high bay and low bay fixtures. Not for use in enclosed fixtures. This 68-watt lamp is shatter-resistant.