Lighting Cobshop.net Cob Lights Data Compilation

[BII]

Finding that right balance is key. To much is easy and to littke will show exactly what your describing. 1 cob per plant for medium sized plants should do it especially with over flow from other lights. If I were to suggest quantity for 1 plant I would say 2 cobs as well as 2 plants. I recently put 3 over one plant and within hours it showed signs of stress.

What do you consider to be the "signs of stress" from too much AutoCOB light, or too much light in general?

 

[BigSm0]

What do you consider to be the "signs of stress" from too much AutoCOB light, or too much light in general?

The edges curled up almost instantly. 165 watts over a single auto is to much.

 

[BII]

The edges curled up almost instantly. 165 watts over a single auto is to much. View attachment 807570

I sometimes see random (no pattern), just a minority, of the very top bud-extruding leaves' tips bending down, much as with excess N, while some point up (even near or adjacent leaves),but the plants are normal color, are doing fine and have not received high levels of N or other nutes. Since this happens with only some plants and some of their leaves on some of their buds some of the time and I can't see any problems with nutrients, whatever the problem (if this is even a problem), I ignore it. In the worst case, I presume the plants are making minor adaptations to high light intensity.

But should I be concerned that this is light stress? And even if it is, is it meaningful stress, actually having an impact, or is it just desirable adaptation to high light with everything fine?

 

[AutoWonders]

I am currently testing 2 cob lights per plant for Gorilla Glue and Afghan Kush Ryder. They are healthy but don't much care for the cob lights closer than 28" - 30". When I did get closer, the plants just flipped me off and made me raise the lights. Truthfully, two cob lights per plant seems a little too much light. Maybe next run I'll try the two lights per plant, but one light off for 12 hours each day or there abouts. Fun with cobs.

 

[Mizzo81]

Yeah I’ve been running one over one plant. Seems to be just right for what I’m doin.

 

[BigSm0]

I was reading on grow weed easy that praying leaves means the plants are border line getting to much light. Usually I lower the lights at this stage. But have had plenty of light stress issues. My current grow is a 4x10 space with 750 watts and had signs of stress so I removed cobs and am now at 450 watts over the same space in flower. The plants are still very stocky but much healthier and growth is amazing.

I think there is still a lot of research needed with autos that are under high efficiency lighting. Like the feeding I feel less is more when it comes to lighting too. We progress each grow, better genetics, better lighting and more knowledge.

 

[mikey2017]

What do you consider to be the "signs of stress" from too much AutoCOB light, or too much light in general?

If u see the leafs standing up as they are praying it's to much light and some people say they like that but not me I tested a cob at different distances and the lower it got the more stress it gave my lady

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[BII]

If u see the leafs standing up as they are praying it's to much light and some people say they like that but not me I tested a cob at different distances and the lower it got the more stress it gave my lady

To me, presuming light intensity is not totally too much, if high intensity light is causing no real damage, it seems like a totally minor adaptation to stress, with the plant likely overall producing more good stuff and simply dealing with the increased heat and transpiration from high light intensity with no real damage to any tissues or slowing of overall metabolism. If you don't see any evidence of any actual leaf tissue damage (e.g., drying out, browning), just leaves bending, praying, adapting and effectively dealing with heat/light stress, I see no problem. Like with humans: working up a sweat from some exercise out in the sun is just your body dealing with similar heat/light stress, probably even good for you.

 

[NastyN8t]

My test with two cobs (no reflectors) for three plants is still working out well. Plenty of light. The The White Train that sprouted twins is flourishing. One sprout is now taller and a bit thicker than the other, however both are going gangbusters. I'm looking for a pretty good yield from the twin Train. The three plants are kind of fighting it out for space, with the Afghan Kush Ryder squeezed in the middle. The Northern Cheese Haze has gotten pretty darn tall and should be a fine yielder as well. All are 3 gallon Smart pots.

I dumped the Blue Cheese and OG Kush CBD as well as the straight coco and changed those to Coco Loco now growing a Haze CBD and a Girl Scout Cookie. 3 gallon Smart pots for those also. Coco Loco out performs Canna coco every time. I will stay with Coco Loco for now on. I might mix the two for a couple plants, but won't be using straight coco again. The Coco Loco loves Canna A&B, Rhiz and Booster. I will probably stick with those nutes only from this point forward. Along with Calmag and organic Blackstrap molasses. Reflectors are on those two cobs.

I still prefer one cob per plant, so I might buy a fifth cob if I feel like continuing with five plants.

I pretty much refuse to grow w out coco loco in my organic soil mix. Ive substituted and changed every other ingredient here and there but coco loco is a constant.

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[AutoWonders]

Currently my four plant grow is relegated to 30" lights to canopy. Any closer and hello canoeing. I'm going to have to start writing down which strains are doing what specifically under the cobs.