Halogen light pin socket bulb power 20 watt energy consumption 20 kwh1000h series osram halostar 24v equivalent to light bulb 25 w socket g4 voltage 12 v light colour warm white light output 320 lumen colour temperature 3 000 k lifespan 2 000 h style glass bulb variable intensity dimmable uv filter length 35 mm diameter 10 mm average annual electricity cost 01951 kwh 39 euros source average electricity cost based on figures from eurosta