Energy saving bulb energy rating b power 20 watt energy consumption 20 kwh1000h series osram duluxstar mini ball equivalent to light bulb 100 w socket e27 voltage 230 v light colour warm white light output 1 160 lumen colour temperature 2 500 k lifespan 6 000 h bulb shape standard style decopipe straight variable intensity not dimmable length 155 mm diameter 65 mm average annual electricity cost 01951 kwh 39 euros source average elec