That is hot man, and my camera does the same thing to the HPS i believe is all camera and thats just what HPS does lol. Well very intresting that you use all perlite, sounds awesome and seems like a hydro set-up but more drain to waste.
I have been very happy with soil and love the smooth hits of it also. I try to keep all organic but recently am not due to one of my bottles in my nute line not being it anymore lol.
but im getting way better results for sure.
I wouldnt thing 5 meters should effect it to much but if there is a lot of bends it might for sure.
Shitty about the inspections bro, once every 3 months seems kinda brutal.