Okay, this may sound a little weird and a little off topic, but may still be related. Has anyone ever tried burning candles for CO2? In a combustion reaction, CO2 is produced like the following example:

CH4 + 2O2 → CO2 + 2H2O

As you can see, oxygen is consumed in this reaction. But during photosynthesis, the plants only need light (photons), water, and CO2 like the following reaction:

2n CO2 + 2n H2O + photons → 2(CH2O)n + 2n O2

So ideally, you wouldn't be losing Oxygen, since the plant will produce as it as a byproduct. I just don't know if the Oxygen the plant produces will be sufficient to nourish the roots during the dark cycles. Does anyone know what this reaction or cycle is called? I can't look it up if i don't know what its called .

So I was thinking if this method would be more practical than dried ice, or even better, to be used in conjugation with the dried CO2.

Here are some problems/concerns that may come up:

1. the grow box/room might get too hot.
2. It might burn down my place....
3. the candle burning may not produce pure CO2. The combustion reaction may produce other gasses produced like Nitrogen (which probably isn't so bad, but still might be an influencing factor on something)
4. Theoretically, the amount of oxygen in the space will be halved since it takes two moles of O2 to produce one mole of CO2. I don't know what the effect of this will be

So I was thinking, blow out the candles during the dark cycle, light it back up during photosynthesis (alot of work, but still better than waking up early in the day and buying dried ice)

Im not a very experienced grower by the way. I'm just trying to think of ways to skip/minimize the ventilation step so that my grow box is a little more discreet/stealth for my next grow. I want to try this method, but I also don't want to buy dried ice every day. My gf didn't approve of me growing so she indirectly made me choose between her or the plants - which i think was bullshit. I thought to myself whats better ganja or tang? I chose the later since tang doesn't grow on the ground and I figured I could eventually have both. But dammit it was so hard to kill my two babies that I cared for almost 2 months...anyways that was a little off topic, but I wanted to share my ideas....

Thanks guys, sorry for the long post ...
oddish Reviewed by oddish on . using dry ice 4 co2 ive got 2 shop lights with 2 builbs in each light, 60 watts each builb, and 4 plants inthe center of the lights. i keep the lights about 2 inches from the top of the plant. the lights are hanging from the clothes rack in my closet. i bought a little fan and some plastic drop clothes (the ones for panting). covered the whole thing with the drop clothes so its hanging from the clothes rack to the floor, got 3 pounds of dry ice put it in a tub with warm water and stuck it in the enclosed area on Rating: 5