Problems since switching to leds

Unsinkableship420

Unsinkableship420

Active Member
Hey guys , having some feeding issues with my girls since changing from hps to LEDs.
I've got a 5x5 with 4 plants just finished week 3 of flower. They are in coco/perlite and been fed dtw 3 times per day, around 20% runoff each feed.
2× 260w v2 kits and 1×320w xl kit.
Lights on temps 21-27c and 55-60% RH.
Using r/o water and adding 0.2 ec calmag before bring total ec to 1.3

So I did my weekly flush on Sunday morning, flushed them down to 0.3ec, then 24hrs later the runoff is matching what I'm putting in 1.3ec, and my blue cheese has started getting random spots all over the top fan leaves... Growth has slowed right down as well....I'm stumped, never had these issues when running hps... Any help would be greatly appreciated
 

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Olive Drab Green

Olive Drab Green

Well-Known Member
Unsinkableship420 said:
Hey guys , having some feeding issues with my girls since changing from hps to LEDs.
I've got a 5x5 with 4 plants just finished week 3 of flower. They are in coco/perlite and been fed dtw 3 times per day, around 20% runoff each feed.
2× 260w v2 kits and 1×320w xl kit.
Lights on temps 21-27c and 55-60% RH.
Using r/o water and adding 0.2 ec calmag before bring total ec to 1.3

So I did my weekly flush on Sunday morning, flushed them down to 0.3ec, then 24hrs later the runoff is matching what I'm putting in 1.3ec, and my blue cheese has started getting random spots all over the top fan leaves... Growth has slowed right down as well....I'm stumped, never had these issues when running hps... Any help would be greatly appreciated
Click to expand...
Overwatered, and you shouldn’t be feeding 3x per week, let alone per day. With that much runoff, definitely overwatering. Hopefully not also lockout from overfeeding.

You should also NOT be flushing weekly, but at the end of the grow or of each phase, if at all.
 
Unsinkableship420

Unsinkableship420

Active Member
Olive Drab Green said:
Overwatered, and you shouldn’t be feeding 3x per week, let alone per day. With that much runoff, definitely overwatering. Hopefully not also lockout from overfeeding.

You should also NOT be flushing weekly, but at the end of the grow or of each phase, if at all.
Click to expand...
Really I'd agree if I was in soil.. I'm in coco/perlite dude, its a hydro medium. This all went like clockwork under hps... Just been having issues since switching to LEDs a few grows ago...
 
Unsinkableship420

Unsinkableship420

Active Member
whitebb2727 said:
Bump the Cal/mag up a bit and dial the other nutes back a bit and see how they respond.
Click to expand...
Funny you say that was just talking with another grower friend of mine, he has more experience with LEDs than me... Said the same thing , bump cal/mag up to 0.4ec ish and tone back on my a+b.... I still don't get why they are building up so quickly though...
 
G

goofy81

Well-Known Member
Feeding as often as you do, I would definitely give a lighter feed. Your leaves are very dark green.
I'm feeding my 5 gallon pots 4 time a day and my 12 gallons 3 times a day and my plants seem to grow insanely fast. In fact I left one tap off accidentally for 2 days (on a12gln) and that plant has definitely slowed down.
 
Rocket Soul

Rocket Soul

Well-Known Member
When you dial in nutes and watering for your plants, coming from hps to led, you need to understand VPD and how it makes your plants transpire. Hps keeps the plants drinking more due to several degrees higher leaf temps, higher transpiration. Calcium being imobile nute means that if the plant transpiring more water thru leaves the calcium that remains in the plant is more concentrated. Now when your missing the infrared heat on your leds they transpire less, so less intake of calcium in general. So adding calmag can make up for this, but also changing enviroment so that it favors more transpiration.



im on board with feeding/watering a little less at least till you get an idea of how long it would take the plant to dry the pot in comparison to hps, and maybe some more calmag. Dont go as low as 21 degrees temp, keep temps 25C minimum during light on.

Heres an online vpd calculator.
http://opennlabs.com/vpd/VPD_calculator.php

Play around with it, for hps id use the +2 or +3 temp setting, with led maybe -2. It will give you approx temps and RH for every phase of the grow. Maybe not something to trust blindly, more use a reference when something goes wrong to see which direction to take your environment.

The trick is to avoid basing your judgement on HPS schedule, watch your plants react to enviroment and nutes and dial it in again.

Edit: Also seems you have a lot of light in there for first grow under QBs. Raise or dim a bit and you will have less deficiencies.
 
Unsinkableship420

Unsinkableship420

Active Member
Rocket Soul said:
When you dial in nutes and watering for your plants, coming from hps to led, you need to understand VPD and how it makes your plants transpire. Hps keeps the plants drinking more due to several degrees higher leaf temps, higher transpiration. Calcium being imobile nute means that if the plant transpiring more water thru leaves the calcium that remains in the plant is more concentrated. Now when your missing the infrared heat on your leds they transpire less, so less intake of calcium in general. So adding calmag can make up for this, but also changing enviroment so that it favors more transpiration.



im on board with feeding/watering a little less at least till you get an idea of how long it would take the plant to dry the pot in comparison to hps, and maybe some more calmag. Dont go as low as 21 degrees temp, keep temps 25C minimum during light on.

Heres an online vpd calculator.
http://opennlabs.com/vpd/VPD_calculator.php

Play around with it, for hps id use the +2 or +3 temp setting, with led maybe -2. It will give you approx temps and RH for every phase of the grow. Maybe not something to trust blindly, more use a reference when something goes wrong to see which direction to take your environment.

The trick is to avoid basing your judgement on HPS schedule, watch your plants react to enviroment and nutes and dial it in again.

Edit: Also seems you have a lot of light in there for first grow under QBs. Raise or dim a bit and you will have less deficiencies.
Click to expand...
Thanks for the replays guys, much appreciated. Ok so I flushed the build up last night , adjusted my calmag to 0.4 ec and dropped back to 1ml per L on the a+b , put me at 1.0 ec . also took the mid day fed off the timer... So now fed once an hr after lights on and once an hr before lights off . I'll have to look at a heater to raise the lights on temps... Just coming into spring so its still cold ,outside temps. With regards to raising or dimming the lights, I queried this on another thread and was shot down in a ball of flames lol.... Apparently I'd be wasting all my light on the walls.... Haha what a member on here told me anyway...Distance from light to canopy is 16-18 inches atm... Should I raise them more?? Man I never thought changing my lights would completely change everything....
 
verticalgrow

verticalgrow

Well-Known Member
Unsinkableship420 said:
Thanks for the replays guys, much appreciated. Ok so I flushed the build up last night , adjusted my calmag to 0.4 ec and dropped back to 1ml per L on the a+b , put me at 1.0 ec . also took the mid day fed off the timer... So now fed once an hr after lights on and once an hr before lights off . I'll have to look at a heater to raise the lights on temps... Just coming into spring so its still cold ,outside temps. With regards to raising or dimming the lights, I queried this on another thread and was shot down in a ball of flames lol.... Apparently I'd be wasting all my light on the walls.... Haha what a member on here told me anyway...Distance from light to canopy is 16-18 inches atm... Should I raise them more?? Man I never thought changing my lights would completely change everything....
Click to expand...
yea if plants not happy then raise them & 840W QB's is a ton of light for 4 plants
 
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Unsinkableship420

Unsinkableship420

Active Member
verticalgrow said:
yea if plants not happy the raise them & 840W QB's is a ton of light for 4 plants
Click to expand...
Ok I'll lift em up to 20 inches?? Haha yeah I knew it was a lot .... I May have underestimated how powerful these qbs are lol. I've got a v1 550 as well in a 4x4 just started veg... They are 4 really big plants dude like the canopy is wall to wall and each in 30L pot....
 
verticalgrow

verticalgrow

Well-Known Member
Unsinkableship420 said:
Ok I'll lift em up to 20 inches?? Haha yeah I knew it was a lot .... I May have underestimated how powerful these qbs are lol. I've got a v1 550 as well in a 4x4 just started veg... They are 4 really big plants dude like the canopy is wall to wall and each in 30L pot....
Click to expand...
Try 24" & if plants look happy in a week go lower if not then raise the lights.

Is ur plant canopy 5 x 5 x 2 foot deep:confused:
 
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