Earthtronics Cf13dl4b2e Ultra-Mini Daylight Cfl Bulbs, 13-Watt, 4-Pk. Compact Fluorescent Brightness: 860 Lumens Estimated Yearly Energy Cost: $1.57 Based on 3 hrs/day. 11 c/kWh. Cost depends on rates and use. Life: 11 years Based on 3 hrs/day Light Appearance: 6500K Energy Used 13 watts