Is this light burn? Nutrient defficiancy? Or over nutrients?

A picture speaks a thousand words (no blurple pics)

 

Ph? Do you check it?
Soil?


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That is a magnesium deficiency

 

you haven't given enough info to give you even an educated guess.
what are you growing in? size of pots, medium?
are you in a tent or room or closet ect
airflow? temps?
how do you water? and how do you know when to water?
you say its a 600w led light. is that actual draw or is that what its compared to?


things to remember when these things happen.
1 Pick up you pots. know how they feel wet and dry/ dont just water because you think they need it. know it. over watering can cause nutrient lockout as the plant takes in as much water as it can and if there isnt much in the way of nutrients in it at that moment then it processes the water but is unable to bring up the nutrients that it needs and hence it begins to look like a deficiency.

2 Transplant. This alone fixes 99 percent of problems and should be the first thing you do when your worried that its not the light burning. even doing a mini transplant works. take it out of the pot gently, cut back about an inch from the bottom and the sides of the pots and then add new soil around and to the bottom. water approptiatly and move on.

get a pick of the whole plant and enviroment and lets go from there

 

i second that. use calmag problem solved .Ordering from outside the US - Google Express Help