Energy saving bulb daylight bulb golf ball bulb energy rating a power 20 watt energy consumption 20 kwh1000h series ecozone biobulb socket b22 voltage 230 v light colour daylight white light output 1 600 lumen colour temperature 6 500 k lifespan 10 000 h bulb shapes spiral tube golf ball style bulb housing length 120 mm average annual electricity cost 01951 kwh 39 euros source average electricity cost based on figures from eurostat as of