Derek asked, Mon, Nov. 13: >This is probably a stupid question but if T-8's are brighter (provide more >light??) than the T-12's, why do you feel that you have to replace your >T-12's with twice as many T-8's Because I want lots more light. T-8's are smaller, brighter, and use less current than T-12's. I am getting the most rapid growth in the 15 gallon tank with 4 T-8's. Paul Krombholz Tougaloo College, Tougaloo, MS 39174