I have a Philips florescent light, 40 watt, 48 inches long. It is classed as a T12 (economical to run). It will last 20,000 hours and gives off a cool, bright white light. Color temperature is 6,500K. The higher the color temperature is, the brighter the light. My sewing room is in the basement and only has one small window. When I flick the switch you would not believe the amount of light I get. I am more than pleased with the result. bea cda