Light stress

yeatster

yeatster

Well-Known Member
I got a new 300w LED, PLC, CX300. I startsed at 30", manufacturer recommendations is 24" - 18"..I have a 4x4 tent, I hung LED off centered to cover said 3x3. After gradually lowering light from 36" to 18" I turned on my other LED, 100w, in the corner.

I noticed leaf tips curling up.

My question:
Will the leaves repair/stop curling?
I am flowering now with autos and not sure if my distance is okay.

I would like the light as close as possible, obviously.

Pics: these are random, progressive. Last one is today.
LED is now 20"

Peace n ty
 

Attachments

  • 20160316_123517.jpg
    20160316_123517.jpg
    712.5 KB · Views: 41
  • 20160315_110323.jpg
    20160315_110323.jpg
    732.8 KB · Views: 44
  • 20160316_123517.jpg
    20160316_123517.jpg
    712.5 KB · Views: 46
  • 20160318_103543.jpg
    20160318_103543.jpg
    638.7 KB · Views: 45
  • 20160318_214059.jpg
    20160318_214059.jpg
    621 KB · Views: 45
yeatster said:
I got a new 300w LED, PLC, CX300. I startsed at 30", manufacturer recommendations is 24" - 18"..I have a 4x4 tent, I hung LED off centered to cover said 3x3. After gradually lowering light from 36" to 18" I turned on my other LED, 100w, in the corner.

I noticed leaf tips curling up.

My question:
Will the leaves repair/stop curling?
I am flowering now with autos and not sure if my distance is okay.

I would like the light as close as possible, obviously.

Pics: these are random, progressive. Last one is today.
LED is now 20"

Peace n ty
Click to expand...
If the light is the cause for the drooping, and you've made the right height adjustment they should bounce fine.
 
yeatster said:
I got a new 300w LED, PLC, CX300. I startsed at 30", manufacturer recommendations is 24" - 18"..I have a 4x4 tent, I hung LED off centered to co........Peace n ty
Click to expand...
Look at the tips of your cola/buds. Are the tips of the pistils brown but the rest of the pistil white? Premature browning of the tips with LEDs is a sure sign that your light is too close. The leaf edges could be light stress, the beginning of a mag deficiency or even a K deficiency. It's hard to tell but she looks a little overwatered too so that might be cause for concern. And if the damage isn't too severe the edges will return to normal.

Nice looking plant btw. Have you asked @Greengenes707 what he thinks? Drop by his thread in the LED section, he or others may have better answers for you there. After all he owns the company :).
 
Thank you both!
I have to head out now.
I have the LED about 2" higher. I am hoping that will be good for now.
My main concern is, will I notice a difference in the leaf curling dissipate if the light it properly adjusted? That way, I know I am in the "green"

Btw, she is not overwatered. I just got over a battle with fungus gnats (fuckers), and she took it the worst.

Heare is both, at home
 

Attachments

  • 20160316_130020.jpg
    20160316_130020.jpg
    1 MB · Views: 11
yeatster said:
Thank you both!
I have to head out now.
I have the LED about 2" higher. I am hoping that will be good for now.
My main concern is, will I notice a difference in the leaf curling dissipate if the light it properly adjusted? That way, I know I am in the "green"

Btw, she is not overwatered. I just got over a battle with fungus gnats (fuckers), and she took it the worst.

Heare is both, at home
Click to expand...
I'm crossing my fingers it's not root issues from the fungus, that would sadden me. Such a pretty plant
 
FranJan said:
Look at the tips of your cola/buds. Are the tips of the pistils brown but the rest of the pistil white? Premature browning of the tips with LEDs is a sure sign that your light is too close. The leaf edges could be light stress, the beginning of a mag deficiency or even a K deficiency. It's hard to tell but she looks a little overwatered too so that might be cause for concern. And if the damage isn't too severe the edges will return to normal.

Nice looking plant btw. Have you asked @Greengenes707 what he thinks? Drop by his thread in the LED section, he or others may have better answers for you there. After all he owns the company :).
Click to expand...
Tips are white. There is a brown/Amber tint to the lower extremities.

Pic of a few random tops:
 

Attachments

  • 20160318_103557.jpg
    20160318_103557.jpg
    758.4 KB · Views: 20
  • 20160318_103619.jpg
    20160318_103619.jpg
    701.5 KB · Views: 20
  • 20160318_103625.jpg
    20160318_103625.jpg
    668 KB · Views: 17
  • 20160318_103631.jpg
    20160318_103631.jpg
    617.3 KB · Views: 18
  • 20160318_103639.jpg
    20160318_103639.jpg
    594.1 KB · Views: 14
FranJan said:
Look at the tips of your cola/buds. Are the tips of the pistils brown but the rest of the pistil white? Premature browning of the tips with LEDs is a sure sign that your light is too close. The leaf edges could be light stress, the beginning of a mag deficiency or even a K deficiency. It's hard to tell but she looks a little overwatered too so that might be cause for concern. And if the damage isn't too severe the edges will return to normal.

Nice looking plant btw. Have you asked @Greengenes707 what he thinks? Drop by his thread in the LED section, he or others may have better answers for you there. After all he owns the company :).
Click to expand...
FranJan, am I okay?
 
yeatster said:
FranJan, am I okay?
Click to expand...

I think your good and it's probably stress from your gnat invasion. What medium are you growing in? What are you feeding them? And if you can, try mixing the tops of your pot's medium, that simple habit will really screw gnats up. Disturbs them while they are nesting/sleeping/laying eggs and will really break their life cycle up. Just mix up the top inch or so with your hand. And I was always taught that if you habitually get gnats you are watering incorrectly but like you say your area might just be "Gnat Central" so it may be something you'll have to always deal with. If you're growing organic I guess predatory nematodes would be an option especially if you're recycling the soil so then after a while they will be part of the fauna in your medium.
 
If your plants are not turning their leafs toward the light due to "a stress of some kind" then; Always move your plants out of direct light when plants are stressed.. Chemistry inside the plant is failed so the leaf can dry out and die.. Then you see light stress so you move lights too far away and they stretch...

If your plants were fine at a set distance from your light they should handle it better as they mature, not worse.. Don't yo yo the light distance just move them well back when stressed or right in the light when they are reaching for it.. (I run my hid lights 1.5 to 2 feet away I am not a fan of super close lighting)
 
You must log in or register to reply here.

Similar threads

S
Is this a sign of light burn and too low??!
Replies
3
Views
377
Delps8
D
G
Yellow tips: Is this light stress? See pics
Replies
7
Views
890
GrowerGirl-eu
G
Dirig0
Possible light stress/overwater/high EC?
Replies
8
Views
858
Hollatchaboy
Hollatchaboy
Dr. Funk
Curled\thinning leaves, light burn?
Replies
2
Views
233
Dr. Funk
Dr. Funk
M
Light stress and LED dimmable lights?
Replies
3
Views
657
Jimski
Jimski
Back
Top