Indoor LED 350Watt leaf burn or what?

[venars]

Please tell me if you think this is leaf burn...plants are under a 350 LED system but I may be too close. Grow tent is only 1.4 mtrs ... Otherwise looks like phos. deficiency....this came from an assortment pack.. perhaps Deimios 60 days

 

[agito]

could be you have to work the light down slow also the bottom leaf could be showing mg as well but you have listed no feed media routine

 

[Hugo]

That looks like Iron or Magnesium def. It doesn't look like light burn. What are you feeding them? in what quantities?

Bring your girl over to the infirmary, fill out the form and you'll get experienced and scholared growers helping you out :thumbs:

 

[Muddy]

Looks like a P deficiency probably from your pH being off and causing a lockout. So the question is, what's your pH?

 

[auto-p]

LEDs typically won't cause light burn. -- light burn is usually related to ultraviolet light ( like a sunburn), and LEDs don't produce any ultraviolet.

I have found that LEDs can cause heat stress, if you allow the plants to touch the LED fixture. Heat stress comes from the dehydration of the leaves and from "cooking" of proteins.

 

[The Squid]

LEDs typically won't cause light burn. -- light burn is usually related to ultraviolet light ( like a sunburn), and LEDs don't produce any ultraviolet.

I have found that LEDs can cause heat stress, if you allow the plants to touch the LED fixture. Heat stress comes from the dehydration of the leaves and from "cooking" of proteins.

There are LEDs that include UV light for sure, you can experience burn from LEDs, don't be fooled. It's more likely that you will notice bleaching first though,since they don't put out too much heat, which means it's too close. But that looks like a ph issue as already stated. Just wanted to say this about LEDs and UV. Blackstars have UV spectrum included and those are the most popular here, that is actually on of many +'s about LEDs, is the UV that they include.

 

[agito]

those leafs are crispy not bleached IMO which is normally a heat issue or pushing the plant to quick with light distance

 

[Mr Piggy]

I'm gonna have to second muddy with the P dep. Doesn't look like much else.

 

[The Squid]

those leafs are crispy not bleached IMO which is normally a heat issue or pushing the plant to quick with light distance

No I wasn't saying they're bleached at all, obviously they are quite crispy. Just saying that LEDs will cause light burn and bleaching, as opposed to what auto-p stated about LEDs.

 

[Mr Piggy]

LEDs typically won't cause light burn. -- light burn is usually related to ultraviolet light ( like a sunburn), and LEDs don't produce any ultraviolet.

I have found that LEDs can cause heat stress, if you allow the plants to touch the LED fixture. Heat stress comes from the dehydration of the leaves and from "cooking" of proteins.

Funny, my Blackstar says 240 UV flowering model on it. LED lights definately cause light bleaching but I have yet to see one actually burn a leaf. That type of damage comes from the radiant heat of HPS or getting too close to high intensity fluorescent. Seeing as the damage to the OP's plant goes halfway down the plant I'd say it's safe to rule out light burn. I'm still going with P dep, I've seen the exact thing on my plants when I had ph issues.