Check out this thread from earlier in the year. http://www.sawmillcreek.org/showthre...p-lights-19-99

i posted some details on the Hyperikon brand Amazon sells. 4' led retrofit 90+ CRI bulbs, 5000 kelvin color, 18 watts for like $11 a bulb. They fit in any T8 or T12 fixture and have a 5 year warranty as well. Some other folks posted some great info in there to.