Energy saving bulb energy rating a power 9 watt energy consumption 9 kwh1000h series osram duluxstar nano twist equivalent to light bulb 43 w socket e14 voltage 230 v light colour neutral white light output 480 lumen colour temperature 4 000 k lifespan 8 000 h bulb shape spiral tube style bulb housing variable intensity not dimmable length 105 mm average annual electricity cost 01951 kwh 176 euros source average electricity cost based o