co2 supplementation, led and max temps

sweettooth

Active Member
posting here as can't find the answer on another site I'm subscribed too.

I'm currently running 2 x leds, a lumatek 600w and a maxibright 1030w Pro in a 1.5 x 3m tent. lumatek 600 is at 100% and maxi is at 75%.

Running co2, currently at 1100ppm. In week 2 of flower. my ambient temps are sitting at 34 degrees, I bought an infrared gun and leaf temps are between 32 and 34 degrees.

Keeping humidity at about 72% atm as that's the sweet spot in vpd graphs

anyone else using powerful leds amd co2? plants look OK currently with the environment but want to know if anyone else is doing the same and if I'm pushing them too hard???
 

MustGro

Well-Known Member
I’m about the same. New to VPD myself and have been looking at the charts this grow. My co2 is at 1300, so we’re close there. My a/c keeps me in a range, so I‘m between 27 to 33c on most days depending on outside temps. I asked in another forum if there was a VPD specific to us co2 growers but drew a blank. I’m watching the leaf edges to see if they curl up, that’s a good indication of heat stress, and I’m just keeping it in that warm range this grow.
I’m running my RH closer to 55 though.

There’s a pic from last week of my purps in week 5, on the last page.

 

sweettooth

Active Member
I've certainly got no curling, girls look really good, I'll be dropping the RH a bit more soon, I'd prefer my temps to be around 31 but finding it sits at 33.8. Don't want to have to introduce aircon as it's another expense. Last time I ran high temps, one of my girls went a bit odd but air flow wasn't great in that corner, much better now. The maxi 1030 kicks out a range of 1100 to 1500 mmols at a height of 24 inches. Im aware that in order to use that light efficiently, co2 HAS to be used but also temps need to be up there too. Last run under the 600 gave me 1.5 gpw so I'm hoping the 1030 will do the same if not more.

I think a lot of the info about temps and ranges is for hid lights which gives off more IR so leaf temps will be much higher than ambient room temps. leds don't give off IR so leaf temps are lower, as long as I'm under 34, it should be good.
 
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