Philips Spiral energy saving bulb 8718291138198 is a small and energy-efficient bulb perfect for replacing traditional incandescent bulbs in your home. It uses only 12 watts of power while providing the brightness of a 40-watt bulb, and it has an E27 cap, which is the most common type of light bulb socket. The bulb emits a warm white light with a color temperature of 2700 Kelvin and has a high color rendering index (CRI) of 81, which means that colors will appear natural and vibrant under its light. The bulb is not dimmable, and it has an average lifespan of 8 years or 8000 hours.