Led bulb energy rating a power 10 watt energy consumption 10 kwh1000h series osram lightify socket e27 voltage 240 v light colour warm white daylight white neutral white light output 810 lumen lifespan 20 000 h bulb shape standard variable intensity dimmable mercury free colour rendering index ra 85 ra length 110 mm diameter 60 mm average annual electricity cost 01951 kwh 195 euros source average electricity cost based on figures fr