I have several 30" tanks (20Ls and 29s) and would like to retrofit some of the T8/T12 fixtures to T5, but I'm having a hard time finding supplies for that size. See 18W bulbs fairly often, but having a hard time with the reflector and ballast. I have also found some ready made 30" fixtures in T5, but would rather retrofit what I have. Any links or pointers in the right direction appreciated.