Energy saving bulb energy rating a power 15 watt energy consumption 15 kwh1000h series philips tornado performance socket e27 voltage 230 v light colour warm white light output 850 lumen colour temperature 2 700 k lifespan 12 000 h bulb shape spiral tube style bulb housing variable intensity not dimmable length 108 mm diameter 52 mm average annual electricity cost 01951 kwh 293 euros source average electricity cost based on figures from