AquaticLife T5HO fixtures all have separate reflectors for each bulb, and are some of the best on the market right now. Because it's on a 40 gallon breeder it puts you into the high light category, with most T5HO systems if put on a 55 gallon tank even a single T5HO 6500k bulb in a AquaticLife is enough to give off enough PAR value to sustain a medium planted tank.
I would suggest using a hanging kit to suspend it around 8" to 12" above your tank so you don't risk the chance of giving the plants light burn. Also because it's high lighting co2 is a MUST in the tank, whether it's a co2 injection system, diy co2, or flourish excel.