Background: I have a 36x40 pole barn, 2 stalls and a tack on one side, 2 stalls, a wash rack, and feed room on the other. Traditional style stall fronts with wood/metal bars and fully closed in rooms for feed and tack. Traditional, flat bottomed trusses sit 16’ high and lights are mounted to those.
Right now, I have three of the below down the aisle, centered in a line, and they do a decent job of lighting the barn. Not workshop quality lighting at horses feet, but plenty of light for 99% of anything of I do (to be honest, I haven’t ever thought to myself “I need more light here” unless I was IN the stalls). I have two additional lights over the wash rack, and I’ll tell you what, combined with the white metal walls in there, it’s BRIGHT. My farrier loves it.
https://www.amazon.com/gp/product/B01ENWKQWM/ref=ppx_yo_dt_b_asin_title_o07__o00_s00?ie=UTF8&psc=1
Been very happy with the setup, I have maybe one light in the wash rack that flickers every now and then, but none of the others do. The LEDs don’t use much energy and they’re waterproof/dust proof. The plan is to put one of these lights splitting the stall dividing walls to light up those some more. I don’t think I need more than half of the illumination from one light in the stalls, but I’m not obsessive about seeing super bright all the way to the floor in there and I know some people are (Not hating on this, btw. Totally understand why, but my guys just aren’t in much.). If I was interested in that, they have half sized ones and I’d put one on each side to solve that problem.