I was looking at the spec charts and the lowest the chart went was -4F. I think that is a lamp issue, not the ballast, as in they will light but not full bright until the lamps warm up. Might want to Google T5 lamp specs and take a look around. They do appear to be better than the T8's though.
My ceiling height is 9 ft., but that is inside a clean white room, about 20 x 20 with 6ea. 4ft 3 lamp fixtures. There is minimal shadow, plenty of light, no complaints.
When I install shop lights, I like to drop them as low as possible without them being in danger of getting hit with normal shop traffic. I would go with the 6 lamp fixtures in a shop though, not near as much reflective surface in a shop.
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