Pin socket bulb halogen light power 20 watt energy consumption 20 kwh1000h series osram hlx xenophot equivalent to light bulb 25 w socket g4 voltage 12 v light colour daylight white light output 460 lumen lifespan 100 h style glass bulb variable intensity dimmable length 31 mm diameter 9 mm average annual electricity cost 01951 kwh 39 euros source average electricity cost based on figures from eurostat as of 2016