Halogen light xenon bulb pin socket bulb power 75 watt energy consumption 75 kwh1000h series osram hlx xenophot socket gu5 5 voltage 12 v lifespan 50 h bulb shape reflector length 42 mm diameter 51 mm average annual electricity cost 01951 kwh 1463 euros source average electricity cost based on figures from eurostat as of 2016