I believe a 8 lamp fixture in a tent is a wonderful idea, if it fits. You will never have the light all the way up, and the sides might bow enough to squeeze it in. You can bring the light down to the canopy with full spread, and have an equivalent amount heat from a 400, and greater lumens at each plant. You will still need good ventilation, and need to take into account the weight of the fixture though, because they aren't light. I am in a basement and hang mine from joists. They do make a 50"x50"x78" by Ledwholesellers, on sale for $119 on Amazon That would be a killer combination, just swap from 6500k to 2700 for bloom, put your 8 plants in there and away you go. LOTS of bud. Peace