Fluorescent light energy rating a power 18 watt energy consumption 18 kwh1000h series osram dulux t plus socket gx24d light colour warm white light output 1 200 lumen colour temperature 2 700 k lifespan 15 000 h bulb shape compact fluorescent tube style bulb housing average annual electricity cost 01951 kwh 351 euros source average electricity cost based on figures from eurostat as of 2016