Fluorescent light energy rating a power 18 watt energy consumption 18 kwh1000h equivalent to light bulb 80 w socket e27 voltage 240 v light colour warm white light output 1 050 lumen luminous intensity 827 cd colour temperature 2 700 k lifespan 10 000 h bulb shape standard style bulb housing colour rendering index ra 81 ra length 137 mm diameter 71 mm average annual electricity cost 01951 kwh 351 euros source average electricity co