GenieMan said:

Not sure if its heat stress or light stress? I usally keep my grow light about 24 inches. I have a King Plus 600 watt ( 125 watt real power) LED. My temps are usally in the mid 70's and my humdity is mostly between mid 50's. I have my plant in the open down in my basement. I did have a fan blowing ovee the top but turned if off for now until I can figure this out. I PH'd my soil while wet with a soil meter which gave me a mid 7 but I also PH'd my soil while dry using a soil test kit which came in at 6.5. I'm using Fox Farm Ocean Forest with no additives. I recently just started using Dr Earth Bud - Bloom nutes half strength. I also got a 120x microscope and didn't see any critters on the top of the leaf. I live in CT so I don't think it would be russet mites. I'm also about 5 weeks into this grow and it's a Northern Light Auto. Oh ya, I water with distilled water every 5 or so days. I let the soil get pretty dry and wait for some run off to come out the bottom. Thanks for any advice.

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GenieMan said:

Not sure if its heat stress or light stress? I usally keep my grow light about 24 inches. I have a King Plus 600 watt ( 125 watt real power) LED. My temps are usally in the mid 70's and my humdity is mostly between mid 50's. I have my plant in the open down in my basement. I did have a fan blowing ovee the top but turned if off for now until I can figure this out. I PH'd my soil while wet with a soil meter which gave me a mid 7 but I also PH'd my soil while dry using a soil test kit which came in at 6.5. I'm using Fox Farm Ocean Forest with no additives. I recently just started using Dr Earth Bud - Bloom nutes half strength. I also got a 120x microscope and didn't see any critters on the top of the leaf. I live in CT so I don't think it would be russet mites. I'm also about 5 weeks into this grow and it's a Northern Light Auto. Oh ya, I water with distilled water every 5 or so days. I let the soil get pretty dry and wait for some run off to come out the bottom. Thanks for any advice.

Click to expand...

GenieMan said:

Not sure if its heat stress or light stress? I usally keep my grow light about 24 inches. I have a King Plus 600 watt ( 125 watt real power) LED. My temps are usally in the mid 70's and my humdity is mostly between mid 50's. I have my plant in the open down in my basement. I did have a fan blowing ovee the top but turned if off for now until I can figure this out. I PH'd my soil while wet with a soil meter which gave me a mid 7 but I also PH'd my soil while dry using a soil test kit which came in at 6.5. I'm using Fox Farm Ocean Forest with no additives. I recently just started using Dr Earth Bud - Bloom nutes half strength. I also got a 120x microscope and didn't see any critters on the top of the leaf. I live in CT so I don't think it would be russet mites. I'm also about 5 weeks into this grow and it's a Northern Light Auto. Oh ya, I water with distilled water every 5 or so days. I let the soil get pretty dry and wait for some run off to come out the bottom. Thanks for any advice.

Click to expand...

dbrzz said:

Your light isnt strong enough to stress the plants. The internodal distance on your stems indicate low light levels and stretching is the result. I have a bud at 6 inches from the SF4000 and the main bud is bigger than the rest, which are around 16-24 inches from the light. Heat from the light itself is usually the stressor. Unless you are pushing high par value lights, which would be several thousand dollars for high output lighting, you cant give excessive light with budget grow lights. Budget meaning $1000.00 or less for a 4x4 space.

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Mugwort said:

Hey dbrzz...your comment regarding par value and lights implying spending “$1000 or less” meeting the lighting needs for a “4x4 space” caught my eye!
Are you saying that all I am doing when I added a second ViparSpectra XS 2000 led light to my 4x4 was create a potential heat problem from excessive radiation from other bandwidths of light outside of the 400 - 700nm range of photosynthetic active light the cannabis plant uses?

Your sf4000 is a great light but I am confused...The sf4000’s specs indicate it is adequate for 4x4 flower coverage and is well under $1000. In my rush to get a light I was growing my first plant (ever) in a closet. I later purchased a 4x4 tent and realized my xs2000 may not deliver adequate coverage when I started to use a SCROG net and wanted to utilize every sq ft of area in tent. I felt I should have purchased the XS4000 or the SF4000 so I added another XS2000, raised both lamps higher above canopy, and turned down the intensity of both lamps to 75%. Are you saying that this is the major difference between a 700-$800 led light like yours—PAR signatures? An expensive (>$1000) led has LESS radiation of unuseful, non-par spectrum light, i.e. the ratio of non-par to par light is less as you pay more?

Click to expand...

dbrzz said:

Your light isnt strong enough to stress the plants. The internodal distance on your stems indicate low light levels and stretching is the result. I have a bud at 6 inches from the SF4000 and the main bud is bigger than the rest, which are around 16-24 inches from the light. Heat from the light itself is usually the stressor. Unless you are pushing high par value lights, which would be several thousand dollars for high output lighting, you cant give excessive light with budget grow lights. Budget meaning $1000.00 or less for a 4x4 space.

Click to expand...

dbrzz said:

Your light isnt strong enough to stress the plants. The internodal distance on your stems indicate low light levels and stretching is the result. I have a bud at 6 inches from the SF4000 and the main bud is bigger than the rest, which are around 16-24 inches from the light. Heat from the light itself is usually the stressor. Unless you are pushing high par value lights, which would be several thousand dollars for high output lighting, you cant give excessive light with budget grow lights. Budget meaning $1000.00 or less for a 4x4 space.

Click to expand...

Mugwort said:

Hey dbrzz...your comment regarding par value and lights implying spending “$1000 or less” meeting the lighting needs for a “4x4 space” caught my eye!
Are you saying that all I am doing when I added a second ViparSpectra XS 2000 led light to my 4x4 was create a potential heat problem from excessive radiation from other bandwidths of light outside of the 400 - 700nm range of photosynthetic active light the cannabis plant uses?

Your sf4000 is a great light but I am confused...The sf4000’s specs indicate it is adequate for 4x4 flower coverage and is well under $1000. In my rush to get a light I was growing my first plant (ever) in a closet. I later purchased a 4x4 tent and realized my xs2000 may not deliver adequate coverage when I started to use a SCROG net and wanted to utilize every sq ft of area in tent. I felt I should have purchased the XS4000 or the SF4000 so I added another XS2000, raised both lamps higher above canopy, and turned down the intensity of both lamps to 75%. Are you saying that this is the major difference between a 700-$800 led light like yours—PAR signatures? An expensive (>$1000) led has LESS radiation of unuseful, non-par spectrum light, i.e. the ratio of non-par to par light is less as you pay more?

Click to expand...