Thanks for you share.It's a few things. Check diode quantity against efficacy is the first thing I check.
Most bar style lights will be pretty close in ppfd uniformity given similar fixture dimensions.
Controller is perfect for commercial growoutside of diodes/spread.. the ability to control them via controller. A controller that lets you set gradual on/off and auto dim/cutoff at set high temps.
You got the 2 main pointsSpread, spread, spread.
The whole point of the bar lights, is that they don't have a nuclear-hot center like quantum boards.
Next step IMO is having the outer edges of the fixture slightly convex to throw more light into the corners.
Now our SE3000 and SE5000 design with UV & IR ledI don't see a bar option for a 2 x 4 space and I also don't see any UV diodes on any of the models you currently offer is this correct @Spiderfarmerled