Halogen light energy rating c power 40 watt energy consumption 40 kwh1000h series osram halolux eco socket b15d voltage 230 v light colour warm white light output 590 lumen colour temperature 2 900 k lifespan 2 000 h style glass bulb variable intensity dimmable length 70 mm diameter 40 mm average annual electricity cost 01951 kwh 78 euros source average electricity cost based on figures from eurostat as of 2016