Halogen light pin socket bulb power 20 watt energy consumption 20 kwh1000h series osram halostar standard socket g4 voltage 12 v light colour warm white light output 320 lumen colour temperature 2 800 k lifespan 2 000 h variable intensity dimmable uv filter mercury free length 33 mm diameter 10 mm average annual electricity cost 01951 kwh 39 euros source average electricity cost based on figures from eurostat as of 2016