Artmann11
Active Member
I only use one. The Scorpion configuration is wider. I did much better with that over the square one.
HLG 600's and leaf burn
- Thread starter Starseed.extracts
- Start date
Starseed.extracts
Member
Great reply and input thank you very much
Kassiopeija
Well-Known Member
Plants will have a different amount of chlorophyl-content if leaves were built in a low radiance environmemt vs harsh radiation.
With less light they will have more and these chlorophyls will also be moved to absorb the directly, like __ __ instead of |.......|.
This means leaves will appear darker and also have a higher surface temperature. This surf. temp would be interesting to know how much of a median difference was there between your vegroom & your flowerroom?
With less light they will have more and these chlorophyls will also be moved to absorb the directly, like __ __ instead of |.......|.
This means leaves will appear darker and also have a higher surface temperature. This surf. temp would be interesting to know how much of a median difference was there between your vegroom & your flowerroom?
Starseed.extracts
Member
Hey! Thanks for the input, as I described above, my veg tent is just "starter tent". So I still veg for 2-3 weeks under my HLG's. And they grew great when the lights were 3+ feet away and turned all the way down.
However when I turned the lights up to 800 ppfd on day 21 (which is still low for flower) my leaves to the top of my canopy fried to a crisp
Starseed.extracts
Member
HLG/Quantum Board Plant Stresses/Issues
Hello. Just wanted to share this tidbit of information that may be helpful to those out there using HLG products or high intensity LEDs for grows. I ran across a number of issues during that appeared to be nutrient/ph issues, but were a direct result ofmy high intensity lights I’ll keep it...
www.thcfarmer.com
I found this thread. This fellow seems to know exactly what I'm talking about. I am going to try what he says and add extra cal-mag, iron, and silica to my feed
Starseed.extracts
Member
hillbill
Well-Known Member
I had to raise 3 130 watt Boards and set them at 100 watts because, well, LED Light Burn. The 4th Board in there is at it’s max of 100 watts. Now running at 15 inches over flat LST canopy. Did this about the 1st and plant response has been awesome. Everyone looks relaxed and happy.
Rocket Soul
Well-Known Member
I dont see why this is such a mystery, early on in this thread youve had advice that mostly covers this issue:
Your plants can obviously not keep up with the amount of light youre giving, increasing intensity 4x over night. If a light recieves 4x the light but isnt able to phosynthesize anymore than currently then extra light becomes heat on the leaves. The plants are not able to pick up that slack cause:
- Too much at one time
- They were already pushed towards their limits. You havent dialed in environment for optimal transpiration or metabolism. You can already see this on your before photos, the plants look healthy but they have a somewhat sloppy stance, not really reaching for the light like a plant does when its drinking properly. Have you got notes on watering, how much and how often, between this run and your successful tent run? If you see a difference in how much they drink then thats a hint. If you also have records of how the environment differed between good run and bad run this would help even more.
Factors constraining transpiration and how to fix:
- Low temp and vpd : increase temps a little, adjust rh accordingly if needed. Most people would use +80F as their lower temp limit, rather than 77F as a high cutoff. Is it possible that you successfull tent runs ran higher temps than you are now? Is there any reason you run temps this low, seems like youre running a led grow on HID parameters?
- Co2: as mentioned by prawn, high co2 will close the stomata causing no transpiration: lower co2 to see if the plants stance improves.
- Spectrum: spectrum intensity, i dont know if thats a thing but there are differences between r-spec, vipar and sun light that really have an impact on transpiration, R-spec being the least drink inducing spectrum. If you wanna read up on this you can google "stomata aperture action spectrum". Basic info gleaned: blue opens the stomata, green closes it. Transpiration action spectrum has several peaks, especially somewhere halfway between 400 and 450nm where normal white leds dont have spectral coverage (also peaks in uv territory). So what to take from this and your experience: no probs in sunlight as its absolutely full spectrum, plenty of deeper blues than led, along with massive amount of IR which heats the leaf and helps the plant transpire. Vipar: the balance between blue and green favors blue by far, so again it wont give you probs.
What to do in this case is a bit hard but it would involve adding blue, especially if you can get something deeper than 450nm or even get some uv.
Metabolism: depends on proper amounts of light, co2, water, nutes and heat(some other in this case unimportant factors aswell).
Light,co2 and water, we know its handled.
Heat: worth noting that heat is necesary for both the transpiration and the metabolism. Even if you keep your vpd tight and have good transpiration you can still have too little heat. If you wanna test to see if your probs is more due to no drink or no metabolism you can try putting an agriculture heating pad under a plant and see if it differs from the rest in how it grows. If it improves then you know.
Nutes: i dont think theres enough here to say your nutes are on point or no. If you resolve the above and still have issues its likely to be the case. Most people i see using high intensity leds use synthetic/hydro and most people who go from organic to chems seem to improve their high watt led grow.
Ymmv
Your plants can obviously not keep up with the amount of light youre giving, increasing intensity 4x over night. If a light recieves 4x the light but isnt able to phosynthesize anymore than currently then extra light becomes heat on the leaves. The plants are not able to pick up that slack cause:
- Too much at one time
- They were already pushed towards their limits. You havent dialed in environment for optimal transpiration or metabolism. You can already see this on your before photos, the plants look healthy but they have a somewhat sloppy stance, not really reaching for the light like a plant does when its drinking properly. Have you got notes on watering, how much and how often, between this run and your successful tent run? If you see a difference in how much they drink then thats a hint. If you also have records of how the environment differed between good run and bad run this would help even more.
Factors constraining transpiration and how to fix:
- Low temp and vpd : increase temps a little, adjust rh accordingly if needed. Most people would use +80F as their lower temp limit, rather than 77F as a high cutoff. Is it possible that you successfull tent runs ran higher temps than you are now? Is there any reason you run temps this low, seems like youre running a led grow on HID parameters?
- Co2: as mentioned by prawn, high co2 will close the stomata causing no transpiration: lower co2 to see if the plants stance improves.
- Spectrum: spectrum intensity, i dont know if thats a thing but there are differences between r-spec, vipar and sun light that really have an impact on transpiration, R-spec being the least drink inducing spectrum. If you wanna read up on this you can google "stomata aperture action spectrum". Basic info gleaned: blue opens the stomata, green closes it. Transpiration action spectrum has several peaks, especially somewhere halfway between 400 and 450nm where normal white leds dont have spectral coverage (also peaks in uv territory). So what to take from this and your experience: no probs in sunlight as its absolutely full spectrum, plenty of deeper blues than led, along with massive amount of IR which heats the leaf and helps the plant transpire. Vipar: the balance between blue and green favors blue by far, so again it wont give you probs.
What to do in this case is a bit hard but it would involve adding blue, especially if you can get something deeper than 450nm or even get some uv.
Metabolism: depends on proper amounts of light, co2, water, nutes and heat(some other in this case unimportant factors aswell).
Light,co2 and water, we know its handled.
Heat: worth noting that heat is necesary for both the transpiration and the metabolism. Even if you keep your vpd tight and have good transpiration you can still have too little heat. If you wanna test to see if your probs is more due to no drink or no metabolism you can try putting an agriculture heating pad under a plant and see if it differs from the rest in how it grows. If it improves then you know.
Nutes: i dont think theres enough here to say your nutes are on point or no. If you resolve the above and still have issues its likely to be the case. Most people i see using high intensity leds use synthetic/hydro and most people who go from organic to chems seem to improve their high watt led grow.
Ymmv
PSUAGRO.
Well-Known Member
I always went full blast from seed, somewhat mimicking outdoors. Just kept the fixture high and let them grow into it. Not saying it works for everyone, but it did for me running different lights every couple rounds and reading the plants. Also make sure your medium is well aerated/quick draining; slower transpiration under led vs hid will have you chasing the wrong culprits imo. Watering habits need to be adjusted due to the same reason( cheap moisture probe helps to back off that tendency).
You'll get it eventually, just takes trail and error. We've all been there
Good luck grower
You'll get it eventually, just takes trail and error. We've all been there
Good luck grower
Rocket Soul
Well-Known Member
This. Change thing slowly and then watch the plant before changing anything more.
rollyouron
Well-Known Member
First time 2 runs with co2 I almost stop using it. Plants looked like shit. My temp was around 75 to 78. Read where temps need to be at least 85. My room now stays around 88 to 90. 60 rh. It make a huge difference. Plants look great.