This 20 watt CFL bulb is specifically designed to have the capacity to be used in a dimming light fixture. This bulb is equivalent to a 75 watt conventional bulb. The light output is 1200 lumens. When dimming, proper care must be taken because these bulbs are not meant to be dimmed below 30% capacity. The technology is not yet available for a CFL that is fully dimmable. When used properly, they should last for the full 6,000 hours. Saves you money and energy, and helps the environment, as well. Manufacturer's 3 year guarantee.