I agree! Those lights are very dim compared to some options out there for sure. You have super tall ceilings - This is not a 12' ceiling (much less 8'-10') you are dealing with.

I think you are really wanting some T5HO lights. Some may say T8HO but taking into account your 3200sqft and a rough stab at 400 sqft per fixture you are looking at a minimum of 8 six bulb fixtures at about 3 amps each which will be a couple circuits. I am actually running 8 now on two circuits in a 40X64X16 in two rows of 4 ea and plan to add two more rows of four lights on a total of 4 lighting circuits. It is super nice having good lighting and I want no issue seeing anywhere. I am running Howard ballasts/fixtures purchased from corslighting on ebay in jacksonville IL using the 5000k lamps. I really like the light and so has everyone that has been in there. Cost is about $110 ea with bulbs shipped.