Energy saving bulb golf ball bulb energy rating a power 7 watt energy consumption 7 kwh1000h equivalent to light bulb 30 w socket e27 voltage 240 v light colour warm white light output 290 lumen luminous intensity 827 cd colour temperature 2 700 k lifespan 10 000 h bulb shape golf ball variable intensity not dimmable colour rendering index ra 82 ra length 93 mm diameter 56 mm average annual electricity cost 01951 kwh 137 euros sourc