THC-CK
Well-Known Member
I do have the vertical style Phillips but I thought they are hotter than running horizontal I only have a couple grows with them I have a lux meter and it says like 22,000 directly under bulb at canopy
Nope, that is the benefit of the vertical fixtures, is that you can run them closer to the canopy. If you think about the bulb itself, it makes sense too.
You should be ok at 20" then.