Led bulb energy rating a power 4 watt energy consumption 4 kwh1000h equivalent to light bulb 35 w socket gu10 light colour warm white light output 255 lumen luminous intensity 545 cd colour temperature 2 700 k beam angle 36 lifespan 1 500 h bulb shape reflector variable intensity not dimmable colour rendering index ra 80 ra length 53 mm diameter 50 mm average annual electricity cost 01951 kwh 078 euros schaltzyklen 50 000 quant