New COB setup, plants not transpiring enough.

IR LEDs would be an expensive way to produce heat, when you could just get an IR heater, meaning radiant heater. BTW if you have too much fan going it can cause leaves to close their stomata, breathing holes, to conserve moisture. So you might want to avoid having a mini hurricane in there.

I didn't know your setup was for veg stage when I said the wattage was low. 14w /sq ft would work fine for that.
 
ttystikk said:
THIS.

Compared to HID lighting, LED emits much less infrared and thus plants need higher temperatures to properly transpire.



Better insulation of your grow space will preserve your power savings. You had to shed excess moisture before you switched; how was that accomplished?

Raising temperatures will naturally reduce RH. Give it a try, keep us updated.

Different lights with different characteristics need a different approach. When you get it right, you'll like the results. I sure did!
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Ok I have installed another wall panel heater today, they are fairly low in power consumption. I am in the tale end of winter over here so the room is currently quite cold 22c. The extra heater should bump that by 2 or 3 degrees. Summer is just around the corner which will help bring the temps up further which will then be easier to maintain the room at around 29c as recommended. I have also aerated my coco with perlite on a new batch of clones. I will see how these changes do over the next few weeks and as a last resort add some IR.

The rooms is a brick room which is quite well insulated except the concrete floor, I could maybe get some rubber mat to cover the floor but conditions are quite stable.

I have an 13" inline exhaust fan with a passive intake that has always kept my humidity in a decent range for vegetation. I also have multiple oscillating fans on the canopy.

Overall I'm loving the COBS, the plants that do ok seem to have massive stems and stack tremendously but they are just not sucking up enough water and it's very easy for them to get over watered.

Ive got them at around 38" above the canopy which is a bit high but any lower and they don't want to grow up and start leaning to the sides. This is another reason I know I have enough light.

Thanks so much everyone for the input, Ill post again in a week or two with an update on the new clones and heater. If that combo doesn't quite do the trick then Ill start playing with the IR.

Cheers.
 
BobCajun said:
IR LEDs would be an expensive way to produce heat, when you could just get an IR heater, meaning radiant heater. BTW if you have too much fan going it can cause leaves to close their stomata, breathing holes, to conserve moisture. So you might want to avoid having a mini hurricane in there.

I didn't know your setup was for veg stage when I said the wattage was low. 14w /sq ft would work fine for that.
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Thanks for the advice. The IR leds wouldn't be added to create radiant heat but rather trigger the plants to keep there stomata's open so they can transpire more. Well that's my thinking anyways.
 
Rahz said:
Incandescent bulbs would provide lots of IR heat, as well as 680-730nm light... just a thought.
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Yeah that's an idea, or halogen for a better spectrum in addition to the IR. If you look up the spectrum for halogen bulbs it's very similar to sunlight, much better than standard incandescent and a little more efficient too. If a person didn't care about power use, they'd probably be great grow lights.

Actually I found an image for it. I guess not that similar to daylight but kind of similar if you scooped the blue/green part out of the daylight. Actually it's exactly the same as incandescent. Apparently I was looking at the wrong spectrum before. I mistook the daylight one for the halogen one, which explains why it looked so perfect.

led-lighting-2.jpg

image source
 
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if you have spider mites in your garden i guess

but thats a separate problem and fortunately one i never have to worry about
 
OneHitDone said:
Isn't this a formula for a spider mite explosion?
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A recipe perhaps, but all plant pests could be offset by using microbes, silica, and maybe aminos

The following happened under my Amare Tech SE 250 2 plants

This grow, the top cola of ONE plant got PM, pretty sure that was due to the cola density was so full that no air could circulate. I tried spraying them with h2o2 but had to cut a few of those bud branches off to get air in between
 
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