Sal, what transmission rates do the filters your using have? I'm assuming Rosco brand? Them things can really eat up some light! I'm still debating the efficacy between filters and colored reflectors in my head.

I'm almost to the point of building the fixtures for the 5' tubes. Been a hard road getting everything else going. Soon, I'll have pics of the "Mar's Lander" I'm tinkering with.

Judging from Pf/Pfr response graphs. A ton response in near UV 300-400nm range is noted. Would flouro blacklights timed opposite from 730nm lighting increase the switch between Pr/Pfr? I wonder. Seems to me that in a HPS system that has almost nothing in that range could use those in between far red cycles. Certainly 420-460nm blue grows plants better but I cant help but to think that 300-400nm might increase potency and flavor without getting too deep into actual UV-B.

Oh, is there a time factor for fluorescent blacklights?