Energy saving bulb energy rating a power 11 watt energy consumption 11 kwh1000h series osram duluxstar mini twist equivalent to light bulb 60 w socket e27 voltage 230 v light colour warm white light output 680 lumen colour temperature 2 500 k lifespan 8 000 h bulb shape spiral tube style bulb housing variable intensity not dimmable length 95 mm average annual electricity cost 01951 kwh 215 euros source average electricity cost based on