Shriveled tops on flowering plant

[Weaselcracker]

Iron deficiency shows up in the parts of the plant that are closest to the light- so don't lower them yet, but I have my 600s 12 inches away from the plants average, as I have for six or more years. It's totally fine to have them that close. Mine are not air cooled lights just bare bulbs, new Hortilux.
Your results might vary- but in my experience those bulbs don't burn plants till they're closer than 8" or so.
Pretty sure I said this stuff on this thread already come to think of it...
As long as there are movement fans blowing air underneath the bulbs so that you don't get hotspots it shouldn't be a problem

 

[cannaruss]

Wht are the temps Frm the top of your plants couse the really looks likes heat stress


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Yes, it looks like heat stress but i dont see how. My 600 is 30 inches away from the tops and i also have mine on the perimeter, its baffling. My high temps never get above 82-84f and i have some serious fans moving some air.

 

[Weaselcracker]

I don't think it needs to be baffling.
Put these terms in google 'gwe iron deficiency cannabis'.

Sorry 420 but in this case I like the GWE tutorial a bit better.