Grow light discharge lamp power 400 watt energy consumption 400 kwh1000h series philips master son philips master greenpower socket e40 voltage 230 v light colour warm white light output 56 500 lumen colour temperature 2 000 k lifespan 32 000 h bulb shape tubular style glass bulb variable intensity dimmable average annual electricity cost 01951 kwh 7804 euros source average electricity cost based on figures from eurostat as of 2016