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You will be MUCH better off just purchasing a T5 retro kit with IceCap SLR reflectors. You will get MUCH more bang for the buck.
A Large portion of light from T12 bulbs is wasted (T8 also). Overdriving gets MORE light in the same SPACE, but lowers overall efficiency. We overdrive becasue we can not get enough T12 lamps over a tank.
T5 bulbs are narrow and lend themselves to narrow SLR reflectors that are very efficient at getting light into the tank. They also allow MANY bulbs to be placed over the tank.
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