This energy saving LED bulb is mercury-free, cool running, and lights up instantly. Bulb lasts up to 30,000 hours, delivers high output for distance and close range indoor use, and resists shock and vibration. Bulb has a standard base. Bulb is NOT dimmable. Recommended for track lighting. UL listed. 8-watt bulb is equivalent to 45-watts. 11-watt bulb is equivalent to 65-watts. 16-watt bulb is equivalent to 75-watts.