Daylight bulb fluorescent light golf ball bulb energy rating b power 18 watt energy consumption 18 kwh1000h series osram dulux d socket g24d light colour daylight white light output 1 140 lumen colour temperature 6 500 k lifespan 8 000 h bulb shape compact fluorescent tube style bulb housing length 153 mm average annual electricity cost 01951 kwh 351 euros source average electricity cost based on figures from eurostat as of 2016