@tokalotapot
Thanks for getting civil! Your OK dude...
I did misspell photo and phyto - your point.
Yes I grow soil - water only organics.....
Somewhere on this site I supplied great detail about the needed nm banding of plants and growth factors related to PAR, PR and pfr.
Search for it - use my screen name as a funnel point.
I gave exact tested nm results for the effective bandwidth for far red effect on the change.....IF, I remember correctly,,,,it begins to work at like 724nm and carries over effectively to like 736nm band. The rise to peak effect and the drop off to ineffective is a bell curve type of value.
While your 740nm is having some small-minimal effect. I still ran my test's on the same model as the post grad students -that was with the finding that 730nm band was the optimal range to use....
I wonder if the use of 730's in you use may bring some better results....
Any way, been there, done that.
Doc