Pin socket bulb halogen light power 20 watt energy consumption 20 kwh1000h series osram hlx xenophot socket gz5 3 voltage 6 v light colour warm white light output 500 lumen colour temperature 3 200 k lifespan 100 h style glass bulb variable intensity dimmable length 40 mm diameter 9 mm average annual electricity cost 01951 kwh 39 euros source average electricity cost based on figures from eurostat as of 2016