Halogen light pin socket bulb power 250 watt energy consumption 250 kwh1000h series osram hlx xenophot socket gu5 3 voltage 12 v light colour daylight white lifespan 50 h bulb shape reflector variable intensity dimmable length 45 mm diameter 51 mm average annual electricity cost 01951 kwh 4878 euros source average electricity cost based on figures from eurostat as of 2016