LED light burn?

I've had a couple problems trying to diagnose my problem. Anyways I've factored out my overwater issue, and possible nutrient deficiency. Does this look like light burn to anyone familiar with it? And if not any nutrient deficiency possibly? The leaves are real crispy to the touch. Affected leaves only top leaves now is one middle leaf.
I have 2 cheap 300w (as advertised) UFO LED lights, i have 3 plants. This plant with symptoms was kept only 11 inches under the light from the main cola until i realized it could be light burn. My other 2 plants which are half its size are about 24 inches under the light and don't resemble symptoms of any sort. Thanks for the input

Light burn has been dogging me hard lately, so I’m researching the hell out of it. I don’t think yours looks like light burn. Best way to tell is look at a leaf that has another leaf laying right on top of it. If it’s light burn the bottom leaf will be greener where it was protected by the top leaf. Kinda like a farmer’s tan for cannabis leaves...

I’m also realizing that light burn can be set off by different nutrient problems (deficiencies and toxicities), which of course is relative to pH, of course, and environment, of course, and genetics, of course! Such a balancing act.

What’s your pH, temp & RH?

ClassicT said:

Light burn has been dogging me hard lately, so I’m researching the hell out of it. I don’t think yours looks like light burn. Best way to tell is look at a leaf that has another leaf laying right on top of it. If it’s light burn the bottom leaf will be greener where it was protected by the top leaf. Kinda like a farmer’s tan for cannabis leaves...

I’m also realizing that light burn can be set off by different nutrient problems (deficiencies and toxicities), which of course is relative to pH, of course, and environment, of course, and genetics, of course! Such a balancing act.

What’s your pH, temp & RH?

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Don't have anything to test PH unfortunately, temp 73-81 and rh is in the 40-60 range.

to be honest.....they just look a little hungry to me.......you will see light bleaching if your getting light burn. basically white or yellow patches. Maybe they need a little cal mag too. either way doesent look like light burn. how often have you been feeding

Normally, when I get signs of light burn it shows as bleaching of the new growth. It's also not uncommon to have older fan leaves fade mas the plant matures. I would try to get a meter to monitor runoff and what you're putting into the grow.

growin-Jables said:

to be honest.....they just look a little hungry to me.......you will see light bleaching if your getting light burn. basically white or yellow patches. Maybe they need a little cal mag too. either way doesent look like light burn. how often have you been feeding

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Last time i feed was 6 days ago and today. I just switched over to advanced nutrients overdrive.

What medium?
How much have you been feeding?
How often?
Getting runoff as well?

Tim1987 said:

What medium?
How much have you been feeding?
How often?
Getting runoff as well?

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Happy frog soil
A tablespoon per gallon of water
Advance nurtients GROW during veg, when i begun flowering i didn't have the proper flowering nutrients up till about week 5 when i started using Advance Nutrients Overdrive.
I feed off and on during veg and has since been fed the Overdrive twice at a teaspoon per gallon.
Yes plenty of water run off but nothing to test the run off.

You HAVE to get a pen to check PH and ppm of both your water source and feed mixes.
You can't guess and expect nothing will happen. Purple stem is creeping interveinal in leaf .
There is a lock out somewhere , looks like P . But no way to tell if you don't know what is going in much less what's coming out. LED will bleach more often than burn.

Led height is a bit close , as most led manufactures say 18-24" depending on stage.

The Dark Brown splotched are what bad PH symptoms look like.
Most PH pens can be had in Amazon for like $11-15 bucks .

Id cut your nutes back. If not all of it. There's pleanty still left in your soil.
Just water each feed, till you start seeing improvement.
If you dont start to see an improvement in a week or two, after a few waterings, let us all know.
I think you've over done the overdrive etc. Sounds like a lot of shit for soil.
Good luck

Budzbuddha said:

You HAVE to get a pen to check PH and ppm of both your water source and feed mixes.
You can't guess and expect nothing will happen. Purple stem is creeping interveinal in leaf .
There is a lock out somewhere , looks like P . But no way to tell if you don't know what is going in much less what's coming out. LED will bleach more often than burn.

Led height is a bit close , as most led manufactures say 18-24" depending on stage.

The Dark Brown splotched are what bad PH symptoms look like.
Most PH pens can be had in Amazon for like $11-15 bucks .

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I've learned i really need one. Hopefully in the next couple days i can make it to the hydro store and pick one up. I'll let you know what it is then.

Tim1987 said:

Id cut your nutes back. If not all of it. There's pleanty still left in your soil.
Just water each feed, till you start seeing improvement.
If you dont start to see an improvement in a week or two, after a few waterings, let us all know.
I think you've over done the overdrive etc. Sounds like a lot of shit for soil.
Good luck

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Sounds good. I'm gonna get a PH tester here in a couple days from the hydro store and see what it's testing at. I'll stop feeding until i get a reading of what it's at. If it continues worsening in the next couple weeks I'm just curious if i will make it to harvest. I'm on day 41 but won't know until i can see the condition of the plant here in the next couple weeks i guess.

Azubaz said:

I've learned i really need one. Hopefully in the next couple days i can make it to the hydro store and pick one up. I'll let you know what it is then.

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Expect to pay more there , although I do like supporting the small stores and such ... Amazon has kept prices low for more common pens.

What is your strain . . .?
Curious

Azubaz said:

Sounds good. I'm gonna get a PH tester here in a couple days from the hydro store and see what it's testing at. I'll stop feeding until i get a reading of what it's at. If it continues worsening in the next couple weeks I'm just curious if i will make it to harvest. I'm on day 41 but won't know until i can see the condition of the plant here in the next couple weeks i guess.

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Grab a couple ph stakes from the hardware. They're more effective for soil. You might have hot spots. You wont know with a pen.
You can get ppm/water stake combos now too.
Just buy a couple of each to check they're accuracy.
They'll each cost about $10 at the hardware.

Tim1987 said:

Grab a couple ph stakes from the hardware. They're more effective for soil. You might have hot spots. You wont know with a pen.
You can get ppm/water stake combos now too.
Just buy a couple of each to check they're accuracy.
They'll each cost about $10 at the hardware.

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Bless for the tip just stopped at the local hardware closer than the hydro in this snow storm, and this is what i gathered. I've never used either as it's my first grow, the digital seems much easier. I don't have the time but tomorrow i will test and let you know. Bless again

Budzbuddha said:

What is your strain . . .?
Curious

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Just got a couple and will have results tomorrow. It's sime bagseed of SuperGlue i got from the local shop

Azubaz said:

Bless for the tip just stopped at the local hardware closer than the hydro in this snow storm, and this is what i gathered. I've never used either as it's my first grow, the digital seems much easier. I don't have the time but tomorrow i will test and let you know. Bless again

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Sweet.
You can get ph ones too.
Make sure wth your soil test kit, in your pic, to dig deep. Thats why i like the stakes instead.
Bless you too!!!

Tim1987 said:

Id cut your nutes back. If not all of it. There's pleanty still left in your soil.
Just water each feed, till you start seeing improvement.
If you dont start to see an improvement in a week or two, after a few waterings, let us all know.
I think you've over done the overdrive etc. Sounds like a lot of shit for soil.
Good luck

Click to expand...

Happy frog contains like ....minimum amount of nutes. On top of that the OP stated he had not fed for 6 days. I can't imagine any plant having nute burn 5 weeks into flower using happy frog and not feeding for 6 days. Makes nore sense that there hungry. I see the most nutrients getting metabolized at weeks 4 through 6 in flower. Which is where the op is. So those plants should be able to metabolize quite a bit at this point tells me that nutrient burn is not likely

If it doesnt get better in a watering or two, then up the fertz.
Easy peezy, and breezy.
Should know whats going on, in your soil, before feeding.
He needs to check his ppm with a meter before anything.
Before water or fertz.
Op still has pleanty of time.