Fluorescent light energy rating b power 16 watt energy consumption 16 kwh1000h series osram cfl square socket gr8 light colour warm white light output 1 050 lumen colour temperature 2 700 k lifespan 10 000 h bulb shape tubular style bulb housing 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