Golf ball bulb led bulb energy rating a power 4 watt energy consumption 4 kwh1000h series osram led star classic p equivalent to light bulb 25 w socket e27 voltage 230 v light colour neutral white light output 250 lumen colour temperature 4 000 k lifespan 1 500 h bulb shape golf ball variable intensity not dimmable mercury free length 80 mm diameter 43 mm average annual electricity cost 01951 kwh 078 euros source average electricity