Nutrient burn? Light stress?

Soil too hot, water double the pot size, this will help to reduce the soils EC

 

Yes very little burn from nutrients probably, but don't look anything to really worry about, just my opinion.

 

It means you're pushing the plant right to the limit of how much nutrients it can take as long as it stays very tiny on the tip you're okay

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If in soil do a slurry test. Take a large shot glass of soil. Dig down a little. Than put that into a Tupperware small container. Than put the equal amount of distilled water. Stir for 1 minute and than stick ur ph meter than ur ppm meter. This will show u what's going on! So if ppms are over 400 u just need water and microbes if u use them. Under 400 ppm feed

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Can't be light burn with that tiny thing..lol. I'M NOT SHAMING!

 

That CFL could be 300w and with the 2 smaller CFL could be close to 400w in a 2ft x 2ft (guessing, looking at the picture) 400w in that space could easily cause heat stress and probably light stress if the canopy is close enough. (100w ft2).

 

What’s the ph of the water you’re feeding with? Sometimes it’s the ph of the water that causes the deficiency no amount of nutrients can solve.

 

In addition to burnt tips, I see burnt edges along the sides tips which would indicate a potassium deficiency. Nute burn doesn't burn the edges like that. This is from this forums sticky, scroll down to potassium deficiency and see if it sounds like the problem.

https://www.icmag.com/forum/marijua...nts-ph-and-pest-troubles?t=11688&page=1&pp=15

 

How close are they to harvest? They are supposed to get a little deficiency towards the last 2 or so weeks but this looks like it’s too early for that. It could also be a calcium magnesium deficiency. Really need you ph of water in, out and ppm/ec in and out. Soil or hydro. Room temps, humidity. If you are using more than the standard 3 part nutrient I would discontinue everything except the basic nuts till figured out.

 

A visual guide to cannabis deficiencies
good quick nutrient guide btw

 

When the plant is exposed to high levels of light, the plant will drink more water and use more food.
I would give the plant some food, grow and bloom nutes or top dress, something like 3.6.6(npk)

 

Take some photos of newer growth. Since you did all these changes the problem could be fixed. My guess is potassium and calcium deficiency/issue which could really just be a ph issue. Always start at ph because if it’s off it doesn’t matter what value your nut recipe is the plants get locked out and can’t mobilize anything in the soil.