This Bell CFL Mini Spiral Light Bulb is a low energy, power-saving light bulb. It uses 9W of power, equivalent to a 40W traditional bulb, and produces 490 Lumens. The bulb has a warm white color temperature of 2700K and an Edison Screw (E27) fitting. It is approximately 104mm high by 37mm wide and has an average lifespan of 10,000 hours. This self-ballasted fluorescent lamp offers up to 70% energy saving and is rated 'A' for energy efficiency. It is not suitable for use with dimmer switches. Voltage: 240V.