Fluorescent light energy rating b power 7 watt energy consumption 7 kwh1000h series osram dulux se socket 2g7 light colour neutral white light output 400 lumen colour temperature 4 000 k lifespan 5 000 h bulb shape compact fluorescent tube style bulb housing variable intensity dimmable length 125 mm average annual electricity cost 01951 kwh 137 euros source average electricity cost based on figures from eurostat as of 2016