Fluorescent light energy rating b power 18 watt energy consumption 18 kwh1000h series sylvania lynx de socket g24q light colour warm white light output 1 200 lumen colour temperature 2 700 k bulb shape compact fluorescent tube length 129 mm diameter 35 mm average annual electricity cost 01951 kwh 351 euros source average electricity cost based on figures from eurostat as of 2016