Fluorescent light energy rating a power 21 watt energy consumption 21 kwh1000h series osram lumilux t5 he socket g5 voltage 230 v light colour neutral white light output 1 900 lumen colour temperature 4 000 k lifespan 20 000 h bulb shape tube light style glass bulb diameter 16 mm average annual electricity cost 01951 kwh 41 euros source average electricity cost based on figures from eurostat as of 2016