Globe Electric 7 watt Enersaver T10 soft white, CFL medium base light bulb, 40 W equivalent is the perfect replacement for your incandescent t10 40 watt light bulb while only using 7 watts of energyl! Globe Enersaver CFL bulbs provide the same light as a soft white bulb while using fewer watts. You can use them in numerous places including table lamps, closet lights and standard applications. Guaranteed to last 9 years based on 4 hours use per day at 120 volt. Lighting Facts; Brightness: 400 lumens: Estimated yearly energy cost (Based 3hrs/day, 11¢ KwH Cost depends on rates and use): $0.84, Life (Based on 3 hrs/day): 9.1 Years, Light Appearance: 2700 kelvin, Energy Used: 7 watts.