Sylvania 24683 - F40DSGN50 - 40 Watt T12 5000K Full Spectrum Fluorescent Light Bulb, 4 Foot Length, (Pack Of 4) Go to amazon.com Related posts Check expert advices for full-spectrum fluorescent bulbs? FeatureColor Temperature: 5,000KAverage Lifetime: 20000 hoursLumens (light output): 2200CRI: 90 Description40 watt 48" T12 Medium Bi-Pin (G13) Base Designer 5,000K Rapid Start Fluorescent Sylvania Light Bulb