This is an 11W Crompton G23, 2 pin, Low Energy CFL PLS Stick Light Bulb. It features a G23, 2 Pin Cap fitting and emits a 4000K Cool White light with 900 Lumens. This bulb is rated 'A' for energy efficiency and is approximately 233mm high by 32mm wide. Compact fluorescent lamps (CFLs), also known as low energy bulbs, save energy by using similar technology to fluorescent tubes to produce equivalent light output to conventional tungsten filament bulbs but with significantly lower power requirements. They also offer a greatly increased life expectancy over conventional lamps. The marked wattage of all energy-saving lamps is much lower than the equivalent conventional bulb, resulting in lower running costs per hour. This bulb is suitable for various applications, including signs, bollards, security lights, and cookers.