Led bulb led spot reflector lamp halogen light energy rating a power 31 watt energy consumption 3 kwh1000h series osram superstar reflector equivalent to light bulb 35 w socket gu10 voltage 230 v light colour warm white light output 230 lumen luminous intensity 565 cd colour temperature 2 700 k beam angle 36 lifespan 25 000 h bulb shape reflector variable intensity dimmable colour rendering index ra 80 ra average annual electricity cost