Halogen light pin socket bulb reflector lamp power 250 watt energy consumption 250 kwh1000h socket gu5 3 voltage 12 v light colour neutral white colour temperature 3 400 k lifespan 500 h bulb shape reflector variable intensity dimmable diameter 51 mm average annual electricity cost 01951 kwh 4878 euros source average electricity cost based on figures from eurostat as of 2016