Energy saving bulb energy rating a power 8 watt energy consumption 8 kwh1000h series philips tornado esaver equivalent to light bulb 40 w socket e27 voltage 230 v light colour warm white light output 500 lumen colour temperature 2 700 k lifespan 8 000 h bulb shape spiral tube style bulb housing variable intensity not dimmable length 85 mm diameter 45 mm average annual electricity cost 01951 kwh 156 euros source average electricity co