Fluorescent light energy rating b power 26 watt energy consumption 26 kwh1000h series osram dulux t plus socket gx24d light colour warm white light output 1 700 lumen colour temperature 3 000 k lifespan 10 000 h bulb shape compact fluorescent tube style bulb housing length 140 mm diameter 12 mm average annual electricity cost 01951 kwh 507 euros source average electricity cost based on figures from eurostat as of 2016