Originally Posted by sshz
No, LED lights do not cause any kind of nutrient deficiency...
That's a pretty bold statement, and I think many LED growers would respectfully disagree, based on their experiences and observations.
If yours are all healthy, that's awesome- sounds like you found the right combinations of nutrient levels and light intensity for your setup, and ahead of the curve a lot of LED guys are facing!
What nutes do you like to run, and what kind of light coverage?
Since most of the people having these issues have been under different "white" light LEDs, like the OPs, that don't have UV unless you add it,
wouldn't you think his situation would be the beginning stages of deficiency?
I'd agree regarding the blotchy yellow leaves, but it seems like that comes later, after the purple petioles and stem streaking. I guess if he starts seeing that, maybe he can start thinking it might be a deficiency.
Good luck OP! Let us know how they progress.
Pictures and/or more details would help avoid some of these sub conversations we're having. Stuff like what wattage you're running the lights, how far from the plants, what strain the plants in question are, type of medium, feed, etc. A better overall picture for us should get a better, quicker overall answer for you ;-)