100W E39 Mogul Base LED Retrofit Lamp for replacing Low Bay/ High Bay HID lamps up to 250W. 120 - 277 Volt. Approved by UL for enclosed fixtures. Active cooling is provided by long life "Mag-Lev" cooling fan which keeps LED's cool even when operating within enclosed light fixtures. UL19913 certified for USA and Canada. Available in Daylight (5700K) or Cool White (4000K)