leaves blackening on top buds

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Noticed a problem last night with my blue cheese in soil. I'm guessing something to do with pH. I broke my meter the other day. The leaves are looking burnt and are drying out quickly. Its only happening on the tops near the buds. Ideas?
 
My leaves look like that when my lights are a little to close.
I don't know about yours the lights don't look to close in the picture.
GL&HY!
 
Its is under a 150 and 70 hps. Don't think its lights. I use farm farms nutes. Looks like they got fried. Maybe I was to blazed mixing nutes and accidently doubled up.
 
boric acid could help, its in the eye wash section, contact lense cleaner. but not sure about that. could still be molybean or copper.
 
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