LED + CO2 ???

I can't find any info on grows using just LED and CO2. Help me out?

Is anybody here using both?

It's a great combination. Are you looking at using bottled CO2 or a burner?

Probably a bottle.

From what i understand, about hid and co2, is that the plants need a particular amount of light and warmer temps to utilize higher levels of co2.

So...how many watts per square foot of light and how warm should the canopy be?

And...does the increased temps not defeat the pupose of led, sorta???

The original link does not work anymore, but Google has a cached version. I don't see any reason why LEDs would be substantially different from other grow lights as far as CO2 goes. How heat is generated and how the light is generated does change the kind of conditions one is looking to create.

http://webcache.googleusercontent.com/search?q=cache:16e61zC6mooJ:www.olemiss.edu/~suman/PhysiologyandMol.Biol.2008.pdf &cd=1&hl=en&ct=clnk&gl=us

"
ABSTRACT
Effect of different photosynthetic photon flux densities (0, 500, 1000, 1500 and 2000 μmol m-2s-1), temperatures (20, 25, 30, 35 and 40 oC) and CO2 concentrations (250, 350, 450, 550, 650 and 750 μmol mol-1) on gas and water vapour exchange characteristics of Cannabis sativa L. were studied to determine the suitable and efficient environmental conditions for its indoor mass cultivation for pharmaceutical uses. The rate of photosynthesis (PN) and water use efficiency (WUE) of Cannabis sativa increased with photosynthetic photon flux densities (PPFD) at the lower temperatures (20-25 oC). At 30 oC, PN and WUE increased only up to 1500 μmol m-2s-1 PPFD and decreased at higher light levels. The maximum rate of photosynthesis (PN max) was observed at 30 oC and under 1500 μmol m-2s-1 PPFD. The rate of transpiration (E) responded positively to increased PPFD and temperature up to the highest levels tested (2000 μmol m-2s-1 and 40 0C). Similar to E, leaf stomatal conductance (gs) also increased with PPFD irrespective of temperature. However, gs increased with temperature up to 30 oC only. Temperature above 30 oC had an adverse effect on gs in this species. Overall, high temperature and high PPFD showed an adverse effect on PN and WUE. A continuous decrease in intercellular CO2 concentration (Ci) and therefore, in the ratio of intercellular CO2 to ambient CO2 concentration (Ci/Ca) was observed with the increase in temperature and PPFD. However, the decrease was less pronounced at light intensities above 1500 μmol m-2s-1. In view of these results, temperature and light optima for photosynthesis was concluded to be at 25-30 oC and ~1500 μmol m-2s-1 respectively. Furthermore, plants were also exposed to different concentrations of CO2 (250, 350, 450, 550, 650 and 750 μmol mol-1) under optimum PPFD and temperature conditions to assess their photosynthetic response. Rate of photosynthesis, WUE and Ci decreased by 50 %, 53 % and 10 % respectively, and Ci/Ca, E and gs increased by 25 %, 7 % and 3 % respectively when measurements were made at 250 μmol mol-1 as compared to ambient CO2 (350 μmol mol-1) level. Elevated CO2 concentration (750 μmol mol- 1) suppressed E and gs ~ 29% and 42% respectively, and stimulated PN, WUE and Ci by 50 %, 111 % and 115 % respectively as compared to ambient CO2 concentration. The study reveals that this species can be efficiently cultivated in the range of 25 to 30 oC and ~1500 μmol m-2s-1 PPFD. Furthermore, higher PN, WUE and nearly constant Ci/Ca ratio under elevated CO2 concentrations in C. sativa, reflects its potential for better survival, growth and productivity in drier and CO2 rich environment"

If you are growing in the same space you live in and your home is well sealed, you probably have high CO2 whenever your windows are shut. Plants do not use much CO2 compared to what a human breathes out. You can buy this to check it out and then resell it it.
http://www.amazon.com/AutoPilot-APCEM-Autopilot-Desktop-Monitor/dp/B008NPA18A

Gquebed said:

Probably a bottle.

From what i understand, about hid and co2, is that the plants need a particular amount of light and warmer temps to utilize higher levels of co2.

So...how many watts per square foot of light and how warm should the canopy be?

And...does the increased temps not defeat the pupose of led, sorta???

Click to expand...

Those are the plants requirements for the conditions to be optimal for growth...what ever type of lighting meets them...meets them.

And no it does not defeat the purpose. If anything it require less energy to counter the heat if your threshold is higher. You don't need to add heat...the led's will get you there. I'm not understanding how it takes the advantage out of LED hands.

Greengenes707 said:

Those are the plants requirements for the conditions to be optimal for growth...what ever type of lighting meets them...meets them.

And no it does not defeat the purpose. If anything it require less energy to counter the heat if your threshold is higher. You don't need to add heat...the led's will get you there. I'm not understanding how it takes the advantage out of LED hands.

Click to expand...

I dont know that it takes the advantage away...i was asking more than stating...lol

So if co2 is best utilized by a specific intensity of light and wamer temps...then do led lights meet the requirements?

From what i understand, leds are much less intense than hid and leds are supposed to run much cooler...

So does this not make them less suitable for grow with co2?

And is this why it is so hard to find grow journals that are doing led+co2?

There are no 'requirements' for CO2 supplementation. Extra CO2 will increase the growth of most species of plants. To what extent would be dependent on other environmental factors. Modern cob leds are as capable as HID lighting for this task.

My last run had CO2

mc130p has ran CO2 with all his runs.
Supra runs at a high co2...not sure if that is his homes furnace or supplemented though.
And I'm sure there are a few more.

Gquebed said:

So if co2 is best utilized by a specific intensity of light and wamer temps...then do led lights meet the requirements?

From what i understand, leds are much less intense than hid and leds are supposed to run much cooler...

So does this not make them less suitable for grow with co2?

And is this why it is so hard to find grow journals that are doing led+co2?

Click to expand...

If your room is going to be sealed, 1w of electricity used = 1w of heat dissipated into the room. So the more efficient the light the more total light output you can use in your space before overheating. Or you can save money on your AC system if not maxing it out.

A HID puts out a lot of light from a very small point of emission. LEDs aren't going to compete on how small that point of emission is, instead you will use a greater surface area per unit of light and have more points of emission, this comes with a nice advantage on light distribution however.

CO2 will be of no help if you have any other bottleneck issue. So that is the one requirement, get your grow down to damn near perfect, then add CO2 to get you that much closer.

Greengenes707 said:

My last run had CO2

mc130p has ran CO2 with all his runs.
Supra runs at a high co2...not sure if that is his homes furnace or supplemented though.
And I'm sure there are a few more.

Click to expand...

actually my last one didn't have CO2, but im lazy so i left the tank sitting there this one I had CO2 but there's been issues so there's no gas now.