Energy saving bulb energy rating a power 21 watt energy consumption 21 kwh1000h series osram duluxstar stick equivalent to light bulb 90 w socket e27 voltage 230 v light colour warm white light output 1 230 lumen colour temperature 2 500 k lifespan 10 000 h bulb shape compact fluorescent tube style bulb housing variable intensity not dimmable length 161 mm diameter 52 mm average annual electricity cost 01951 kwh 41 euros source avera