Medium screw base. For indoor use. Replacement for 40 watt G25 in candescent lamps. Lasts 33 times longer, uses only 8 watts. Free of UV and IR radiation minimizing discoloration and fading of materials. No warm up time, instant-on with full light output and stable color. Contains no hazardous materials. Dimmable down to 10 percent and rated at 50,000 hours life with a correlated color temperature (CCT) of 3000K, 85 CRI and 430 lumens.