LED’s and calmag ?

[WeedSexWeightsShakes]

IMO they look better in those pics.
If it was me I’d get my humidity up higher like 70 with those temps.
My veg tent is usually around 78 degrees with humidity ~80. Growing in reused coco with lots of perlite.

What nutes do you use? What kind of soil?

 

[CobKits]

I'm fighting problems with my girls too under LEDs, so don't feel alone.
Matter of fact, I'm probably going to ditch my LEDs and go back to HIDs.
For one no way can I run my rooms in the 80s, I don't hit 80s when running HIDs with just good air exchanges.
My nutrient profile works for every lighting I use besides LEDs and that includes my outdoor plants.
I consistently pull 1.2-1.6 gpw under my 750 DE.
By the time I add heat and the added cost of my nutrient profile change I lose the efficiency of running LED over HIDs.

if you need the heat hps is a no brainer

 

[nonamedman420]

Mine are also 3 weeks in, but the problem first appeared already in the first week. I then got it fixed. I dont know how, i thought it was because i lowered the calmag and raised the base nutes.

Thanks for the replies. Im keeping my temp at a stable 83f now and i turned down my humidifier to get the humidity below 70. I was tipped of to check out this vpd chart and follow it, but i think maybe that wasnt the best idea. What kind of air humidity are you growing in?

i don't think that chart takes into account leaf surface temperature. try this one instead.
http://opennlabs.com/vpd/VPD_calculator.php

check this video out:

low temps + high humidity is not the same as high temp+ high humidity, the former is more likely to grow molds/fungus etc.., the latter not so much. a bad (vpd) can make plants burn in weak solutions, even in just tap water (nute burn in tap water, this may be a source of mystery problems attributed to a suspected bad ph when it's not, or nutrient deficiencies when the nutrient solution is well balanced to begin with). check this video out about signs and symptoms of too high a VPD:

plants react very differently in flower and in veg to different VPD values so they should be tailored to the stage of growth. that first link shows better ranges for the different stages of growth, that chart you linked doesn't iirc.

this may be the key to suspected magesium and calcium deficiencies under led's, the plant is transpiring either too fast or too slow to take the nutrients and water up in the correct ratio for good growth.

 

[nonamedman420]

another thing i haven't seen mentioned too many times here, and i think it's a carry-over from growing with hid's... under led's, you probably shouldn't blast them with a fan directly like you would in a hid tent, it causes the leaf surface temp to get too low, and the leaves to transpire too quickly, which causes nutrients to accumulate in the leaves, which burns the plants. my friend's plants looked a whole lot better and grew a lot healthier when we used less direct airflow. the differences between growing under led's and growing under hid's is night and day. i'd listen to everyone and see what makes more sense, but at the same time be willing to try something different when things aren't working how they should for you but is fine for others. you seem to be able to take advice well, so i doubt you'll have problems for long as long as you use your head and keep an open mind. happy growing!

 

[nonamedman420]

i really think that "VPD too high" video is an eye opener. @ 3:23 seconds in is some crazy solid info.

 

[Viceman666]

another thing i haven't seen mentioned too many times here, and i think it's a carry-over from growing with hid's... under led's, you probably shouldn't blast them with a fan directly like you would in a hid tent, it causes the leaf surface temp to get too low, and the leaves to transpire too quickly, which causes nutrients to accumulate in the leaves, which burns the plants. my friend's plants looked a whole lot better and grew a lot healthier when we used less direct airflow. the differences between growing under led's and growing under hid's is night and day. i'd listen to everyone and see what makes more sense, but at the same time be willing to try something different when things aren't working how they should for you but is fine for others. you seem to be able to take advice well, so i doubt you'll have problems for long as long as you use your head and keep an open mind. happy growing!

I never really considered this.. i guess when i was thinking about air to the plant I was trying to avoid wind burn but didnt thought about the fact that it would reduce leaf temp and/or cause more transpiration.. and more I look at it my plants who had the most issues are those who have the fan closest to them.. so something ill look into for my next grow! Thank you! Ill look into your 2 videos too! Thx for sharing

 

[nonamedman420]

I never really considered this.. i guess when i was thinking about air to the plant I was trying to avoid wind burn but didnt thought about the fact that it would reduce leaf temp and/or cause more transpiration.. and more I look at it my plants who had the most issues are those who have the fan closest to them.. so something ill look into for my next grow! Thank you! Ill look into your 2 videos too! Thx for sharing

it's amazing what a different point of view can do for you. i've gained the most knowledge from comments that seemed to be outta left field, but in actuality was the missing link to finding my problems. i tend to read horticulture articles, written by greenhouse workers.
here's a great sire for sound info: https://puyallup.wsu.edu/lcs/

edit: no problem buddy, i'm just trying to shine a light somewhere for you. not sure i'll succeed in helping you, but at the very least, i gave you another tool to put in your box. give a man a fish and it feeds him for a day, teach him how to fish.... and well, you get my drift. happy growing my friend.

 

[boilingoil]

if you need the heat hps is a no brainer

It's not just a heat issue. I'm interested in finding a cure for the problems when running leds whether it's adding IR or UV diodes or even running a 315 CMH along side of the leds.
I'm just looking for a starting point as far as supplementing diodes to overcome the deficiencies of the white leds .

 

[WeedSexWeightsShakes]

It's not just a heat issue. I'm interested in finding a cure for the problems when running leds whether it's adding IR or UV diodes or even running a 315 CMH along side of the leds.
I'm just looking for a starting point as far as supplementing diodes to overcome the deficiencies of the white leds .

I have quantum boards and no deficiencies...no problem running leds here.

 

[Rahz]

Hey, whats your opinion on LED’s and calmag supplementation ? Im having major problems with calcium lockout or deficiencies, and cant really tell wich one it is, making it really hard to fix the problem ...

Has anyone experienced similar difficulties with LED grows? This is my first LED grow and its my first time experiencing calcium deficiency/lockout ever.

The led im using is a HLG 260w 4000k

I've been using LED various white spectrums for years, never had a deficiency in DWC and never used supplements. One nutrient formula I use contains 6% and 2% cal/mag respectively. I've needed to use cal/mag in soilless peat/coir mix but that's pretty normal right?

 

[1212ham]

i really think that "VPD too high" video is an eye opener. @ 3:23 seconds in is some crazy solid info.

There is more to it than VPD alone. http://www.just4growers.com/stream/temperature-humidity-and-c02/vapor-pressure-deficit-the-hidden-force-on-your-plants.aspx

" The problem with running a high relative humidity when growing indoors it that fungal diseases can become an issue and carbon filters become less effective. It is commonly stated that above 60% RH the absorption efficiency drops and above 85% most carbon filters will stop working altogether. For this reason it is good practice to run your RH between 60-70% with the upper temperature limit depending on your crop's ideal VPD range, in the example it would be 64-79°F (18-26°C.) "

 

[1212ham]

For one no way can I run my rooms in the 80s, I don't hit 80s when running HIDs with just good air exchanges.

Yeah, maintaining good temperature and humidity can be a pain. Is your grow in a cool area? What would your room temperature be without the grow?

 

[coreywebster]

I have quantum boards and no deficiencies...no problem running leds here.

Yeah I'm the same. I just cant understand why more folks than not do have issues.

 

[coreywebster]

IMO they look better in those pics.
If it was me I’d get my humidity up higher like 70 with those temps.
My veg tent is usually around 78 degrees with humidity ~80. Growing in reused coco with lots of perlite.

What nutes do you use? What kind of soil?

Two things we have in common here.
My RH is higher than most though not as high as yours.
Plus I also use reused coco, some is years old.
I also have hard water. Do you?

 

[boilingoil]

Yeah, maintaining good temperature and humidity can be a pain. Is your grow in a cool area? What would your room temperature be without the grow?

Constant 65 degrees in my basement without the lights on. With the lights on (750DE and 250 watts of LEDs) and 80 degrees outdoor temps and a 70 pint dehuey running full time my room gets to 77 degrees.

The problem is that the plants were started in Happy Frog and still showed the deficiencies from the start.

 

[nonamedman420]

is it a deficiency, or too much nutes causing an imbalance that mimics what a deficiency? if they transpire faster or slower than they should, it will effect how much EC the plant needs to look deficiency free. i linked a video where he specifically talks about having to reduce ppm's by 25% to offset the higher or lower than ideal VPD (can't remember off top of my head). so it has a lot more to do with VPD than one would initially believe. if you're under or over feeding, because your VPD is too high or too low, you will see a myriad of symptoms and they will mimic other problems you've encountered in the past, and you will try to fix it with your past experiences and it won't work. i'm just saying, the more i learn, the more i realize i need to learn more, and how much misinformation gets passed around unknowingly, because the person thought correlation meant causation and thought what worked for them will work for everyone with a similar problem.

 

[1212ham]

It's not just a heat issue. I'm interested in finding a cure for the problems when running leds whether it's adding IR or UV diodes or even running a 315 CMH along side of the leds.
I'm just looking for a starting point as far as supplementing diodes to overcome the deficiencies of the white leds .

In a cool area where added heat is needed, I wonder if LED can offer much other than a better light spread?
I guess I think of LED as different, rather than deficient.

 

[boilingoil]

In a cool area where added heat is needed, I wonder if LED can offer much other than a better light spread?
I guess I think of LED as different, rather than deficient.

I can say that my plants under the LEDs seem to need feed less often then the one under HIDs. And the difference between the one under HIDs and LEDs is noticeably different.

 

[WeedSexWeightsShakes]

Two things we have in common here.
My RH is higher than most though not as high as yours.
Plus I also use reused coco, some is years old.
I also have hard water. Do you?

Yep just tap water. Think ppms are like 80.

 

[WeedSexWeightsShakes]

I can say that my plants under the LEDs seem to need feed less often then the one under HIDs. And the difference between the one under HIDs and LEDs is noticeably different.View attachment 4138362

Which is hid and which is led?