Does any one have any experience with C02 exhale b...

I use them i believe they help a little .I don't have way to measure co2 though . .I put them as close to plants as possible currently running over 800 ppfd in veg with no problem and have run extreme high dli using them with no light burn had slight photo bleaching at 3100 ppfd at main tops, 2100 ppfd main canopy on autos before but no light burn

0 point in using co2 unless your already pushing the plants to absolute limits of growth.

Air we & plants breathe is 78% Nitrogen (Innaacessible to plants) 20% Oxygen and 0.04% Carbon Dioxide. Average air we breathe in is 400ppm co2 The problem with locking in co2 supplementation you cant properly ventilate the tent for cooling without jacking the co2. *hint* the 0.04% along with 100% you exhale is much heavier than oxygen, gravity will pull it to lowest point of any environment, get yourself a 15w inline fan and have it suck the co2 as close to floor as you can. Use yeast + sugar or - & Baking soda + Vinegar Using these you can easily keep co2 over 1600ppm

Yeah I’ve never used them.. some people swear by them.. I think it’s a bit of a stretch to say they do much, especially if you’re moving air like you should thru your grow area