50 WATTS MR16 GU10 BASE EXN FLOOD HALOGEN LIGHT BULB WITH LENS COVER 120 VOLTS 4,000 HOURS 36 DEGREE BEAM SPREAD 4 PACK MR16 EXN Halogen Bulb, Covered Lens, 50 Watts, 120 Volts GU10 Base, 36 Degree Flood Beam Spread, 2.063" Maximum Overall Length 4,000 Hour Long Life Quartz Halogen Bulb Lasts Up To 4 Times Longer Than Standard MR16's Transformer-free operation allows the bulb to run directly off the main voltage supply (110/120V) while the ceramic base is designed to withstand a high degree of heat. Can be dimmed without the need for a special dimmer.