Fluorescent light energy rating b power 16 watt energy consumption 16 kwh1000h socket gr8 light colour neutral white light output 1 050 lumen colour temperature 3 500 k lifespan 6 000 h bulb shape tubular style glass bulb colour rendering index ra 80 ra length 138 mm average annual electricity cost 01951 kwh 312 euros source average electricity cost based on figures from eurostat as of 2016