55 watt spiral compact fluorescent gives the same amount of light as a 250 Watt Incandescent lamp. Except ours will save you more than 70% in energy usage. Also available in a 5000K color temp. Here's the facts: Energy usage: 55 watts, compares to 250 watt incandescentBase: Medium E26Color Temp: 2700KLumens: 3600120VLength: M.O.L. 8.39"Diameter: 4.45"Base Width: 2.95"Base Height: 4.06 Lifetime: 8000 hoursUse only in dry locationsNot for use in totally enclosed recessed fixturesNot for use with photocells, dimmers and motion control devices NOTE: THESE LAMPS ARE SELF-BALLASTED SO USE ONLY WITH UNBALLASTED FIXTURES.