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2.1 = 1100 but there's a reason why it was working well. Check my other posting. 720 may be good but you're transpiration rate was a little low because of "low" temp + RH value = VPD on the low side, per my other posting.

At 74 and 62, your grow is a little cold and the RH is a little high. The best site for VPD I've found is here. VPD is like "feels like" for humans. From the picture below, at 74 and 62%, your "vapor pressure deficit" is about 0.9. VPD is the "vapor pressure deficit" between the inside of the...

Now I get the "wheelsman" handle. Great attitude. Every day is a gift.

According to the manufacturer, those lights will use 252 watts to generate a PPFD of 181µmol across a 2'x 4'. Cannabis will survive above 64µmol with seedlings generally being given 150-300 and then 500 in veg and up to 1000 in flower. The lights are not very efficient - 252 watts over 2' x 4'...

I was stationed near Fayetteville NC back in the 80's and that approach to parking was not unknown at some of the "less refined establishments". Lots of mudders but not many 'Vettes, though.

Jacks 3-2-1 at full strength is pretty strong. I get to 700 or 800 (500 scale) and then back down. It does look like a mag def. Jacks is a well balanced fert and, if you've had this issue before, it makes me think that it's something in your environment. Are you familiar with VPD? VPD can...

If they started flower on 7/7, you're about 2 weeks in so my thinking is that you'll be fine but use a light touch. And there's no reason to not continue to keep things tidy underneath. The big win is that you've got a great looking set of leaves - lots of leaves and branches. Those are signs of...

That's exactly the system I had settled on, also with 2 buckets. Nice that you've got the room for the external res. I'd have to get a custom cut tube to get it to fit in my (cramped) grow space. I think that setup will serve you well. The external res makes the system more stable, in terms of...

For me, yes. I remove the larf from the underneath but I am loathe to remove leaves until they've sensesced (the plant migrates nutrients from the lower, older leaves to new growth); unless they're very old (because leaves that are 50 days± are becoming photosynthetically inefficient); or...

Heh, great choices! Why would you switch from PA Hydro to Hydra? Also, I'd very much appreciate your insights about how growing cannabis might be different if I were to switch from my current setup to either PA Hydro or Hydra. I've looked at both of those vendors as alternatives to my current...

Heh, thought I'd add my tuppence after running the Koolatron for a couple of months… It works like a total champ! Again, thank you for this excellent idea and keeping this thread "between the guard rails". I started building it with a retired Inkbird but switched to using a retired AC...

Agree, especially that last bit. The plant in the photo I just posted had a couple of fans under the hood but it wasn't enough — I got hit by bud rot two days prior to chop date. It was my first photo after five auto grows where 20 hours of light pretty much eliminates the chances of bud rot...

mistakes" - eh, I don't see evidence of mistakes. Your plants are doing really well and these discussions will, hopefully, get move things to "great". "sweet spot" - I grow my autos at a DLI of 80± because that's the DLI for 1kµmol at 20/4 (or so - it's been a few years since I grew an auto)...

I'm really not clear on the point that you're trying to make. There are a lot of factors in the grow environment, no doubt about it. "Doubling the light output is more likely to stress the plant and cause harm than it is to help the plant produce drastically more flower…" Without specifics...

The relationship between increasing DLI and yield is almost linear. In his videos of earlier this year, Mitch Westmoreland shared some of the info about the research that he's done as a PhD candidate under Bruce Bugbee. One nugget that he provided was that cannabis yield can be estimated as 0.2...

I'm new too - 3 years and counting. I've attached graphic about the things that make up a grow environment. You've covered a few of them but should work through the list to get things working better. Light - is low. For a plant of that age, cannabis will thrive at double the amount of light...

There's nothing wrong with that approach. A lot of growers are quite happy with getting "two to four ounces" out of their plants. If that's what people are shooting for, increasing light levels by 10% a week will help ensure that they don't exceed their expectations.

Per @Moflow it's a micro mol. DLI ("daily light integral" = how much light is falling on a plant in a day) is expressed in mol but PPFD (how much light is falling on a square meter every second) is expressed in µmol. On macOS, µ is option m. You can type is in windows as Alt+0230. I'm a hydro...

AC Infinity lights perplex me. I'm a fan of their products and have been using them for a few years. Their lights are the exception, though. For you consideration, look at the PPFD map for the Evo here and for the Spider here. I've pasted the images themselves below. The EVO The standard...

If you remove leaves, you will reduce growth and yield. Generally speaking, rather than removing leaves, which is the only way that plants can make food, I would put fans under the canopy to ensure that you have good air flow. I use Govee RH and temp sensors under the canopy so I can monitor...