Philips 872790084448100 is an energy-saving spiral bulb with a normal cap and cool daylight color temperature. It is rated at 15W but provides the same light output as a 70W incandescent bulb. The bulb has a lifespan of 8 years and is dimmable. It also features a built-in day/night sensor that automatically turns the light on at night and off during the day. This makes it ideal for outdoor lighting applications, such as security lighting or path lighting. The bulb is easy to install and fits most standard light fixtures.