Circular light fluorescent light power 22 watt energy consumption 22 kwh1000h series osram lumilux circline socket 2gx13 light colour daylight white light output 1 800 lumen colour temperature 6 500 k lifespan 8 000 h bulb shape circular tube style glass bulb colour rendering index ra 80 ra length 230 mm diameter 230 mm average annual electricity cost 01951 kwh 429 euros source average electricity cost based on figures from eurostat as of