Fluorescent light energy rating b power 13 watt energy consumption 13 kwh1000h series osram dulux d socket g24d light colour warm white light output 1 800 lumen colour temperature 2 700 k lifespan 8 000 h bulb shape compact fluorescent tube style bulb housing colour rendering index ra 80 ra length 170 mm average annual electricity cost 01951 kwh 254 euros source average electricity cost based on figures from eurostat as of 2016