Triangle Bulbs T40144-4 (4 Pack) - 23-Watt (100W) Spiral Medium Base Natural Daylight (5000K) CFL Light Bulbs, 4 PACK 23 Watts 4-Pack 100-Watt Equivalent Natural Daylight Compact Fluorescent Light Bulbs 120 Volts Uses 23 watts for 1600 lumens of brightness (100-Watt Equivalent). Bulb life is 12000 hours. 5000-kelvin color temperature, Natural Daylight /Grow Light Natural day light gives a cooler shade of color best used to enhance room's mood