Hey HDS,
IMO, out designs share the same
primary concept------how to get the most plant material exposed to the light/s.
Do you agree?
View attachment 3521386
This is how I handled the plant training----the bottom limbs (in bottom tubes) are trained outward and the upper limbs trained upward-----even though there is three 1ks in that "tunnel"------the effective light from each light is ~600 watt with a hood.
In your case, I suggest trying a screen between the lights and your tubes-----it probably could just be stood up---if not----hung from the ceiling----just make sure your hands/arms will fit through.
Do you know the total yield from last crop?
A~~~