The other product I mention was calmag but the typo put calming, cal mag is calcium magnesium and it helps clear up spots if its the problem but I didn't think about the spraying, if u are spraying them with a chemical them it could be light burn since water can absorb sun faster than the leaves I have seen people use tubing that runs into the roots to directly add water and nuts weiothout needing to worry bout light cycle changes