Energy saving bulb energy rating a power 8 watt energy consumption 8 kwh1000h equivalent to light bulb 40 w socket e14 voltage 230 v light colour warm white colour temperature 2 700 k lifespan 8 000 h bulb shape spiral tube style bulb housing colour rendering index ra 82 ra length 101 mm diameter 46 mm average annual electricity cost 01951 kwh 156 euros source average electricity cost based on figures from eurostat as of 2016