If you haven't purchased your 8 bulb BB...
I own one and love it but the times they are a changing
In my other tent I am using 4 x 4ft T8 LED tubes @ 22w per + some led screw bulbs below canopy
I am growing the same clones in both, but in my BB I had 324w of mostly red spectrum heavy exotic aquarium tubes. I get great yields, but the tubes cost roughly $25 each when you factor in shipping/taxes. The question is how long do they last?
We know that 600+ nms phosphors do not last as long as blue (450-500), but LED diodes will last many times longer than cfl.
I paid $35 per tube + shipping for 22w tubes. Believe me 22w led gives 54w HOT5 a run for it's money. Why? Well HOT5 distributes homogenous light in 360*s, hence the need for reflectors. However, LED tubes light 100% straight down in ~ 120* coverage
My led tent is ~ 110w vs 324 HOT5, with better red balance for flowering. I would say I have ~> half the yield under 1/3 the wattage. Next grow I will be adding ~ 45 more led watts. That might just level the playing field