Fluorescent light energy rating a power 18 watt energy consumption 18 kwh1000h series osram lumilux t8 equivalent to light bulb 100 w socket g13 voltage 230 v light colour neutral white light output 1 350 lumen colour temperature 4 000 k lifespan 20 000 h bulb shape tube light style glass bulb length 590 mm diameter 26 mm average annual electricity cost 01951 kwh 351 euros source average electricity cost based on figures from eurostat