Looking for advice from experienced grower using LEDs

My plants are shriveling at the ends a and have some discoloration as shown in the pictures... Looking for advice as to what the problem is... Thanks for any advice(not limited to a LED only if you have any suggestions I am happy to hear!)

I am far from an expert but they will probably ask age, what kind of soil, nutrients, amount of nutrients, ph of water, pictures without the led light.

To get the best answers photos should be taken under natural light.

I doubt the problem has anything to do with LED. What is your soil, nutrients, how much do you feed? From what little I can see from the blurple color, looks like nute burn.

agreed yo' tips be burnin son

They are about 2 and a half weeks. I am using sunshine advanced #4 for my medium.
CSN17 Coco and Soil Grow 3-1-2 and cal mg for nutrients thus far. I think i may have been over watering and possible started the nutes too soon... It got super cold in my garage and the led light wasnt producing much heat so I turned the garage temp up... Should i just skip nutes for a few days?