Did you ever decide on a light system? The t5s put out more light than a t8. Where a t8 might be a 40 watt in a 4'. A 4' t5 will be more common as a 54 watt. Also t5s seem to have more precise spectrums, par ratings and nm measurments. To get the exact what your looking for. In my many reef aquariums over the years. I have used halides, t5s and LEDs. Best results being with t5s. So far gardening, My halide seems to have out performed my LED. One is growing tomatoes and one peppers though. My replacement t5 and halide bulbs get here tomorrow. To compare all three. I am thinking a 400 watt halide would do 6-9 flats easily. Even if you had to move a couple here and there. My 150 watt halide maxes out at 2 flats if I turn them, but it can crank out a 6" tomatoe in 3-4 weeks easily. I am still experimenting with my 55x3watt LED fixture.
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