Fluorescent light energy rating b power 26 watt energy consumption 26 kwh1000h series osram dulux d socket g24d light colour neutral white light output 1 800 lumen colour temperature 4 000 k lifespan 15 000 h bulb shape compact fluorescent tube average annual electricity cost 01951 kwh 507 euros source average electricity cost based on figures from eurostat as of 2016