Sick from Using Leds

[SPG*]

Hi. Ive had this strain from Early 2011 and grown it Virtually everytime under a HID or two and Have never Encountered this Problem.Problem is (first time vegge btw) that the plant has Developed Rust Patches on the leaves as well as Bleaching which i Understand and see Happens with Certain Strains and so raise the light higher to avoid that but the Rust Patches Havnt a clue
Was Gonna try adding Cal Mag? is that likely to Solve this?
Thx for ya time

 

[Dream Time]

The brown spots look like magnesium deficiency to me... spots on the older leaves that gets worse and then they start to curl and die, while new grow still looks good.

I don't think you're getting bleaching. I run a 650watt LED light and when I get too close, it looks like this::

It is the almost pure white patches on some of the leaves at the top of the bud.

I think the cal/mag is a good idea.

Good luck!

 

[rives]

I've found that, for whatever reason, LED grown plants seem to require higher levels of both calcium and magnesium than when using other light sources. Necrotic spots in the middle of the leaves are usually from calcium deficiency.

 

[theherbalizor]

Odd, my led plants using a 1200w mars 2 are growing well without calmag. But again I am finding they are slower to finish than their hps counterparts.

Awesome lights for vegging, I'm still not sold on the flowering.

 

[SPG*]

I'm Still abit Dubious tbh.
Definately the strain though the chems and especially the brum cheese also a small bscheese x killer skunk seem totally unaffected.

 

[Weezard]

I find that some strains take to LEDs happily.

I have 2 strains here that do not.
Those 2 don't do well with cfl either, and are even a little dodgy in sunlight.
For the rest, the biggest problem under leds is over watering, or rather slower transpiration.
They take up water more slowly so it has the time to go stagnant and asphyxiate the roots.
Closest I find to a "fix" for those "calcium spots" is to run the PH a tad lower and water less.
Turned them right around.

Aloha,
Weezard

 

[Sat X RB]

dunno about lights but seems to me that plant is so far into flowering the fan leaves have passed their use-by date. they are no longer doing their thing now the plant is in flower so the plant is shedding them. no worries I think ... enjoy the smoke ...

 

[Weezard]

"use-by date"
I like that.
But, were that the issue, wouldn't there would be more yellowing from the bottom up?

Aloha,
Weeze

 

[vapor]

mag def///

 

[SPG*]

This is from the Mars 2 900w led which was the First led I had and introduced Half way through Flowering Earlier this year.Sure these vegging seedlings were introduced when the time Frames Coincided..

Also quite sure the led would of been 4'(?) away.As you can see Bleaching is on One and Starting fast on the other
Same strain btw

Herbilizor your Gonna come across this at some stage ^^^^ [top pic]
(Forthcoming genes etc!)

Started using CalMag last night

Thx For Reassurance guys.5 wks flower btw

 

[rives]

Using CalMag late in flowering isn't recommended by a lot of people because of the level of nitrogen in it. I fought this for a long time because my water has virtually no calcium or magnesium in it, and most nutrients are compounded based on the fact that most water has relatively high levels of both. For this reason, I changed to Veg + Bloom, which has much higher levels of both than most nutrients. I also keep about a 1/2 teaspoon of epsom salts under the drip point from my blumats.

I would recommend that you either get your water analyzed or get the water analysis from your utility to see exactly what the makeup of your water is. Having that information is critical to selecting the right nutrients.

The V+B thread link is here. Sift through the rants about who is is posting for whom, and check out the results -

https://www.icmag.com/ic/showthread.php?t=234171

 

[SPG*]

Taa for the heads up and to Echo saw a friend today who lives nr me who mentioned that the water in my area has changed and so the blotches of rust are not the fault of the LED!
Still,would of thought as long as the PH is correct the Nutes would Provide all that's needed?..

Some plants are Simply more sensitive IMO but I shall keep adding this CalMag until Flush. [^^ like I say some are totally ok(?)]


The "altered"water must be that deeply affected then that this renders the calmag in the Nutes pretty useless?