That light will have to be at least 2 feet from the substrate, possibly higher, or you will have too much light to easily manage. I understand how you plan to use the lights, but the plants won't be impressed. If you are doing this to please yourself and your guests, etc. this should work very well. I think there will be a lot of light spill over, but possibly having the T5 bulbs close to the front and back of the fixture housing will eliminate enough of that so it isn't annoying. If you can use just one T5HO bulb that would make this work out much easier, I think.