Energy saving bulb daylight bulb golf ball bulb energy rating b power 30 watt energy consumption 30 kwh1000h series megaman compact 2000 socket e27 voltage 230 v light colour daylight white light output 1 900 lumen colour temperature 6 500 k lifespan 10 000 h bulb shape compact fluorescent tube style decopipe straight colour rendering index ra 90 ra length 178 mm diameter 65 mm average annual electricity cost 01951 kwh 585 euros quant