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Plants dying in flower ?

Hello,
pH is at 5.8
Water temps 60
ppm 1200
Humidity 44, temps 72
They are at week 7 of flowering; LED lights are 20 inches from canopy, before I had very intense lights at 16 inches away and thought light burn because of the top buds turning white .. so I replaced them with the one I’m using now at 20 inches away and much weaker .. no change tho.
The leaves are showing brownish/ orange leaf tips are crispy and pointing down as seen in pic. What am I doing wrong ?!?

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