Halogen light pin socket bulb power 1 000 watt energy consumption 1 000 kwh1000h socket sfa21 voltage 230 v light colour neutral white light output 33 000 lumen colour temperature 3 400 k lifespan 15 h style glass bulb variable intensity dimmable length 70 mm diameter 25 mm average annual electricity cost 01951 kwh 1951 euros source average electricity cost based on figures from eurostat as of 2016