This is a 13W Bell Dimmable G24q-1, 4 pin, Low Energy CFL Stick Light Bulb. It features a G24q-1, 4 Pin Cap fitting and a Colour 840, 4000K Cool White light. This bulb is energy efficient with a lifespan of 10,000 hours and produces 900 Lumens. It is approximately 130mm high by 34mm wide. Energy saving lamps, also called compact fluorescents lamps (CFL) or low energy bulbs, save energy by using the same technology as a fluorescent tube to generate equivalent light outputs to a conventional tungsten filament bulb but with a significantly lower power requirement. They also offer huge increases in life expectancy over conventional lamps. The marked wattage of all energy saving lamps is much lower than the equivalent conventional bulb therefore costing less per hour.