Globe Electric 9 watt Enersaver cool white, CFL medium base light bulb, 40 W equivalent will save you money by using less energy than regular incandescent bulbs while providing the same light output. This G25 CFL light bulb uses up to 75 percent less energy than a regular incandescent light bulb yet produces the same light output. One CFL light bulb lasts up to 10 times longer than an incandescent light bulb and CFL light bulbs save you money in energy costs while being environmentally friendly. Lighting Facts; Brightness: 500 lumens: Estimated yearly energy cost (Based 3hrs/day, 11¢ KwH Cost depends on rates and use): $1.08, Life (Based on 3 hrs/day): 9.1 Years, Light Appearance: 2700 kelvin, Energy Used: 9 watts.