I'm pretty sure that 850 is high enough not to disrupt flowering...
as the cycle mentioned above,
ir exposure trips the decay of some hormone into another which causes flowering. indoors, you can do this also, by just having a dark period long enough to let the signals decay on their own and induce flowering...
It is the near red that is destructive, i wouldn't want to be below god idk 700 750nm or so,
i mean,
the cutoff is there, and from what I remember reading, I think it was an article from Ed entitled something about the frontier of lighting or something like that,
that,
the cutoff for what red does and does not affect flowering to be a pretty good switch, meaning you aren't going to be having hermies unless you really force it to happen,
meaning,
you'll be able to tell if the plants arent flowering right, due to the disrupted night cycle, as near red is the switch, the clock.
- which implies that all other frequencies are good to use, all the time, as long as you take out the near red for some part of the day.
IR is only really necessary as the off switch for a couple minutes a day, but outdoors, IR is bouncing around perpetually.
So i think that your safe. I mean , leds at 850 are not going to range below 820. so its "high" enough.