Energy saving bulb energy rating a power 20 watt energy consumption 20 kwh1000h series philips esaver dimmable equivalent to light bulb 100 w socket e27 voltage 230 v light colour warm white light output 1 200 lumen colour temperature 2 700 k lifespan 8 000 h bulb shape spiral tube style bulb housing variable intensity dimmable length 127 mm diameter 61 mm average annual electricity cost 01951 kwh 39 euros source average electricity