I have (2) 150W bulbs close to my 4' tank to get the most out of them. This leaves a dead spot near the center brace. I will be using a light mover to move both lights back and forth over each half of the tank. Though I think will use a stepper motor to run them at an even rate over the entire photoperiod, no back and forth. After the photoperiod, they will return to home for the next day.
Hahn, I will be using threaded rod (or acme rod) and a simple guide bar to support the lights and move them. The light rack will also hold the dimmable T5. The "rack" will be on a pulley system to raise and lower it. In your case you could just build the rack into the hood.
Bean