Fluorescent light energy rating a power 10 watt energy consumption 10 kwh1000h series osram lumilux t8 socket g13 light colour warm white light output 650 lumen colour temperature 2 700 k lifespan 20 000 h bulb shape tube light style glass bulb variable intensity dimmable length 470 mm diameter 26 mm average annual electricity cost 01951 kwh 195 euros source average electricity cost based on figures from eurostat as of 2016