I've grown monster plants with those lights so I highly doubt it's a lack of light. I could see maybe too much red spectrum this early on that's why I added a T5HO fixture to that shelf for more blues a week or two ago.
I can't post pics here of the plants i've grown with those LEDs but they certainly had massive yields.
Here is some peppers under those LED early winter before aphidapocolyps
I can't post pics here of the plants i've grown with those LEDs but they certainly had massive yields.
Here is some peppers under those LED early winter before aphidapocolyps