Energy saving bulb daylight bulb golf ball bulb energy rating a power 20 watt energy consumption 20 kwh1000h series sylvania mini lynx fast start socket e27 voltage 230 v light colour daylight white light output 1 100 lumen colour temperature 6 000 k lifespan 15 000 h bulb shape compact fluorescent tube style bulb housing variable intensity not dimmable length 136 mm diameter 48 mm average annual electricity cost 01951 kwh 39 euros sour