Maybe an interesting experiment.
Because the "shop leds" are so dang expensive, theres another route. Perhaps the ""screw-in" type flood light? I have glanced at those on Amazon. Something like this:
https://www.amazon.com/Morsen-Greenh...led+grow+light
So maybe a side by side with one of those, and a plain led spotlight. I happen to have one on the side of my house. Its crazy bright, I dont know the specifics, but it could be the placebo.