Golf ball bulb incandescent light energy rating f power 25 watt energy consumption 25 kwh1000h series osram classic p equivalent to light bulb 20 w socket e14 voltage 230 v light colour warm white light output 200 lumen colour temperature 2 700 k lifespan 1 000 h bulb shape golf ball style glass bulb variable intensity dimmable diameter 45 mm average annual electricity cost 01951 kwh 488 euros source average electricity cost based on f