What is the importance of far red light?

[shag]

@immygod

I will report results soon.

Did you have any luck?

@shag

A new study shows far red reduces yield.
I have not read the study yet, but I suspect that statement may be incorrect in most cases.

Stretch can reduce yield by itself.
Rar red without the right ratio can cause excessive stretch.
The ratio of far-red to deep red is important.
Ratios are more important than levels.