Fluorescent light energy rating b power 55 watt energy consumption 55 kwh1000h series osram dulux l constant socket 2g11 light colour neutral white light output 4 800 lumen colour temperature 4 000 k bulb shape compact fluorescent tube length 530 mm average annual electricity cost 01951 kwh 1073 euros source average electricity cost based on figures from eurostat as of 2016