Do you know why the stems are red? I have that as well under leds like this.
From what I've read, red stems are from either the plant being minorly hungry, cold temps or genetics (lines that purple for instance). I've never really paid that much attention to them, though given that I rarely feed my plants - its probably hunger related.
On the other hand, all of the plants I run and resulting smoke always do the job, so I wouldn't worry too much about it as long as the leaves themselves don't show deficiencies.