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Still getting light burn on tips even at low lighting.

  • Thread starter Thread starter Pazman21
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Still getting light burn on tips even at low lighting.

Pazman21 23 Replies 4,485 Views
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Pazman21

Pazman21

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#1
Hey guys,

so growth has been really good, but as my autos get taller they are receiving a little bit of light burn at the top tips of the canopy. I even have a light meter, which is sitting at about 6000 Lux at the moment. From my research for veg 15,000 - 50,000 is optimal so I'm sitting on the very low side at 6k. I even raised my light to the highest possible position. Any tips or info would be greatly appreciated. Thanks, guys.
 

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#2
Plants look great - I do not see signs of light stress.

Your humidity looks to be a bit on the low side. Coupled with the heat of summer results in those very pronounced inter-veins and slight twist on the newer leaves.

A little environmental adjustment will go a long ways - other than that you are doing a fantastic job keeping those girls happy!
 
#3
Leaves canoe, wrinkle, edges serrate with to much light.. I would max that light out asap..
Keep it watered.. I don't subscribe to letting the pot dry out completely.. It depends on the temperature and light intensity.. You have to dial it in
 
#4
GreenMtnGuru said:
Plants look great - I do not see signs of light stress.

Your humidity looks to be a bit on the low side. Coupled with the heat of summer results in those very pronounced inter-veins and slight twist on the newer leaves.

A little environmental adjustment will go a long ways - other than that you are doing a fantastic job keeping those girls happy!
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Hey man, thanks a lot for the feedback, and will do. Thanks for the tips. :)
 
#5
30roll said:
Leaves canoe, wrinkle, edges serrate with to much light.. I would max that light out asap..
Keep it watered.. I don't subscribe to letting the pot dry out completely.. It depends on the temperature and light intensity.. You have to dial it in
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I have a dimmer on my light, currently, I have the light as high as it will go in the tent. Would you recommend dimming?
 
#7
30roll said:
How many true watts is the light??
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2000W LED for a 2x4 i know over kill. but I have a dimmer and a light meter. so I'm trying the recommended amount with the meter but still having signs of burn on the tips.
 
#8
Your light pulls 16.5 amps from the wall???
No what is the rating printed on the driver??
 
#10
Pazman21 said:
2000W LED for a 2x4 i know over kill. but I have a dimmer and a light meter. so I'm trying the recommended amount with the meter but still having signs of burn on the tips.
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Once again, 6000 lux will not stress a cannabis plant that is more than a couple weeks from seed. Your plants are not exhibiting light stress. The slight issues you see are in direct correlation with high temps/low humidity. Your plant is minimally affected and you should be focusing on nudging your environment, not your lights.
 
#11
Lux meter doesn't really work with blurple light. In fact its pretty worthless. 20k would probably fry them. Apples and oranges.
 
#12
GreenMtnGuru said:
Once again, 6000 lux will not stress a cannabis plant that is more than a couple weeks from seed. Your plants are not exhibiting light stress. The slight issues you see are in direct correlation with high temps/low humidity. Your plant is minimally affected and you should be focusing on nudging your environment, not your lights.
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I try to keep my humidity anywhere between 60 to 70%, and temps stay low 20s. here is another picture of the burned tips. so it may not be humidity.
20210813 223117
 

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#13
growsince79 said:
Lux meter doesn't really work with blurple light. In fact its pretty worthless. 20k would probably fry them. Apples and oranges.
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well fuck lol wish I knew that before buying it. what would you suggest?
 
#14
Burnt tips usually means more fertilizer than it could handle for whatever reason..
I've been watering with the same food for many weeks, but then I pulled a bunch of leaves and all of the sudden the plants couldn't handle the food because there were less leaves to process and breathe.. Lesson learned. Burnt tips as a result..

It's not bad at all and the plant will snap back. Just be aware..
 
#16
Pazman21 said:
well fuck lol wish I knew that before buying it. what would you suggest?
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Tape measure -trial and error. Blurple lights are all different. 2' might be a place to start. Read manufacturers recomendations.
 
#18
Pazman21 said:
I try to keep my humidity anywhere between 60 to 70%, and temps stay low 20s. here is another picture of the burned tips. so it may not be humidity. View attachment 1157081
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Your humidistat shows some pretty extreme night/day swings. Adjust your environment. The burn at the tips of your leaves says a tad too much fertilizer. Some would say that level of burn is perfect as you are just barely pushing the plant out of its comfort zone.
 
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