50 WATT MR16 FLOOD FRONT GLASS LENS COVERED HALOGEN LIGHT BULB WITH BLACK BACK - 120 VOLT - GU10 BASE - 38 DEGREE BEAM SPREAD - LONG LIFE 4,000 HOURS - BLACK BACKING PREVENTS LIGHT FROM ESCAPING OUT THE REAR OF THE LAMP - Industrial Grade MR16 halogen lamps use a quartz envelope for durability and pure tungsten for longer life. The regeneration cycle continuously restores the filament, creating a 5 times longer burning life and clear crisp white light. Nickel end pins resist heat and provide positive electrical contact. Precision reflectors provide excellent light control with a fluted mirror. Dichroic coating removes 65% of the heat by passing it through the back of the lamp, resulting in a cooler light beam ideal for retail displays.