Circular light fluorescent light circline energy rating a power 22 watt energy consumption 22 kwh1000h series osram lumilux circline socket 2gx13 light colour neutral white light output 1 800 lumen colour temperature 4 000 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