Halogen light pin socket bulb reflector lamp power 20 watt energy consumption 20 kwh1000h series osram decostar 35 equivalent to light bulb 25 w socket gu4 voltage 12 v light colour warm white luminous intensity 3 200 cd colour temperature 3 000 k beam angle 10 lifespan 2 000 h bulb shape reflector variable intensity dimmable diameter 35 mm average annual electricity cost 01951 kwh 39 euros source average electricity cost based on figu