Light burn?

E

ecuaodor_s

Member
Hi all, started 4th week of flowering. I see yellowing and marks on top leaves that directly receive light, bottom leaves are just fine. Is this light burn? ( I lifted the lights as high as possible now (around 35 cms - 12 inches)) or is there another underlying condition? Thanks!
 

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It definitely could be light burn. 12 inches is pretty close, really depends on what the light is (HPS/LED/ brand). What does the manufacturer suggest?
 
Yes I think you may have cooked that plant. The serrations all seem to be trying to be as jagged and pointy as possible to cool off. 12 inches is probably to close. What does your par map suggest? Probably more like 18 inches. And you just moved to 12 inches?... how close were you before
 
ProPheT 216 said:
Yes I think you may have cooked that plant. The serrations all seem to be trying to be as jagged and pointy as possible to cool off. 12 inches is probably to close. What does your par map suggest? Probably more like 18 inches. And you just moved to 12 inches?... how close were you before
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I think i didn't realize how fast she is growing in stretching phase so the light was about 10 inches away for a few weeks. Now i am at 12 inches.

The light i have is this:

Model: 120W LED grow light
Power Supply: Meanwell / Lifud
Efficiency: 2.6 umol/Joule
LED Bulbs: Samsung LM301B 3500k (512), Cree 660nm (20), Cree 730nm (8), LG UV 390nm (4)
Coverage: Up to 60x60 cm
 
Phytoplankton said:
It definitely could be light burn. 12 inches is pretty close, really depends on what the light is (HPS/LED/ brand). What does the manufacturer suggest?
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Hi phytoplankton,

Here is the specifications of my light:

  • Model: 120W LED grow light
  • Power Supply: Meanwell / Lifud
  • Efficiency: 2.6 umol/Joule
  • LED Bulbs: Samsung LM301B 3500k (512), Cree 660nm (20), Cree 730nm (8), LG UV 390nm (4)
  • Coverage: Up to 60x60 cm
No suggestion on the box :(
 
So are you using ratches straps or anything. You should be creative and get the light up as high as u can or start training and bending the plant down. Use zip ties or something... get rid of straps if your using em
 
SIKE1 said:
What kind of soil? How often do you water?
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Just standard gardening soil. Nothing special. I water once a day around a liter and sometimes once in two days around 2 liters. Whenever the meter shows me still green but close to red.
 

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ProPheT 216 said:
So are you using ratches straps or anything. You should be creative and get the light up as high as u can or start training and bending the plant down. Use zip ties or something... get rid of straps if your using em
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Thanks for the tip Prophet. Just did and manage to get to 16inches away.
 

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BeauVida said:
Nute issue. Plants like light and heat.
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This is the only thing i use. Been adding 1ml to 2 liters then i upped to 2 ml to 2 liters and recently realized the suggested dose is a bit less but it's not that bad. Also doesn't explain why only top leaves are effected?
 

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ecuaodor_s said:
I think i didn't realize how fast she is growing in stretching phase so the light was about 10 inches away for a few weeks. Now i am at 12 inches.

The light i have is this:

Model: 120W LED grow light
Power Supply: Meanwell / Lifud
Efficiency: 2.6 umol/Joule
LED Bulbs: Samsung LM301B 3500k (512), Cree 660nm (20), Cree 730nm (8), LG UV 390nm (4)
Coverage: Up to 60x60 cm
Click to expand...
bra you dont have light burn lmfao i keep my 240 watt led panel like 10 inches away from my tops and yours is 120watt 10 inches away is fine.
 
ecuaodor_s said:
This is the only thing i use. Been adding 1ml to 2 liters then i upped to 2 ml to 2 liters and recently realized the suggested dose is a bit less but it's not that bad. Also doesn't explain why only top leaves are effected?
Click to expand...
Exactly when have you started using pk13/14 all way from seedling stage right through or what??
 
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