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    Does such a device exist?

    Very much so. Inkbird were the first to market that I'm aware of. I used them for a while until AC Infinity rolled out their lines of products. I've been using their products for a couple of years now and am very impressed. Off the top of my head, I've got six of their devices in my tent. Highly...
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    Humidity

    A dehu in the tent? How big is your tent and where is it situated?
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    PPFD and DLI Questions

    You're welcome and I'm glad you found the vids useful. "I look for any signs of stress on my girls but have only seen growth and great looking changes." - that's the ticket. As long as you're attentive, you're good to go. After about the second week in flower, you should be at max PPFD. The...
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    PPFD and DLI Questions

    You're probably referring to Dr Bruce Bugbee. Bugbee is the head of crop physiology a the University of Utah and, arguably, one of, if not the, leading researcher on cannabis. Over the past three years, I've studied all of the research of his that I can find as well as research from other...
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    5 plants in 2x2

    That will definitely keep them small!
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    5 plants in 2x2

    Re. the light - I feed my plants well (light is how plants make food, right?) "Some people told me the power of it can harm the plants." - sure. If you try, you can harm your plants. I grow my plants at well over 1kµmol and have given my plants too much light almost once per grow. It pisses...
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    5 plants in 2x2

    It's not just an issue of training - you need to cut your veg time very short. I'd look at topping at 21 days and flipping right after that. No way I would not top - per below, you're going to have some challenges lighting the grow but topping will make things a little easier to manage...
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    Interesting? Samsung Shifts Focus: Exit from LED Business to Prioritize Semiconductor

    And something else will come up that will be more efficient and cheaper. Technology is relentless.
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    Interesting? Samsung Shifts Focus: Exit from LED Business to Prioritize Semiconductor

    They got out of a market that decimated dozens/hundreds of companies because there simply wasn't/isn't innovation in computer manufacturers — it was, and is, all about paying a fee to Microsoft for their OS and assembling the piece parts into a generic box. Some companies have made it through...
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    Interesting? Samsung Shifts Focus: Exit from LED Business to Prioritize Semiconductor

    If demand is there, price may rise buy new supply will come into the market, causing prices to fall. That's simply the way economies have worked since hominids started exchanging things. At one time is was my two sharp rocks for the one strong spear. Now we use currency but it's the same...
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    Interesting? Samsung Shifts Focus: Exit from LED Business to Prioritize Semiconductor

    LED's are electrically efficient but saving energy is accomplished by many other things than LED's. Also, they're just saying that they're getting out of the LED market. That doesn't mean that they're not developing more efficient types of lighting. How many companies make incandescent bulbs...
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    Humidity sensor problem

    Per @Triplefastaction, if you bought a "six pack" of sensors, their accuracy is questionable. A bought a three pack of Govee wireless sensors (temp and RH) and they've maintained their accuracy since I bought them in March. They're $40 for three of them and the reason for a three pack is that...
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    Brown spots on yellowing leaves

    Agreed - some of the leaves have dead tissue, some are just yellowed. Remove the leaves that have dead tissue.
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    Is this light burn or something else?

    At 400µmol, your plants are getting about 50% of the light that they can use to achieve their genetic potential. When I tested Korona/Photone back in 2021, the programmer didn't specify the weight of the paper that's used as a diffuser. I discussed that with him (email) and I think he went...
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    2x4 tent , light upgrade.

    You're welcome re. the posting. Re. power supply - appreciate the info. I looked that the XS1500 Pro and it looked riveted on but, now that I check the product listing on Amazon again, the picture of the 2500 shows the driver detached. That's helpful. Part of the reason that growers are...
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    Drying Humidity and Temp

    No clear - the plant is outdoors or indoors? If you're in veg, you'll want a combination of temp + RH that work out to a VPD of 1.0. If you can't get that much moisture into the air, make sure to monitor the plant for nute burn because, if your VPD is 1.6, you're taking up 50% more water than...
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    Auto seedling looking sick..Nutrient deficiency or light burn?

    I've heard a lot of myths about autos but nutes specifically for autos is a new one. It's all the same 16 (or 18 ) chemicals. Some come in pretty bottles, some are in bags but it's all the same 16 (or 18 ) chemicals.
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    Led yields..

    If you're getting 6 ounces out of a 2' x 4' there's something awry with your environment. I grow from seeds and find that the yield estimates from vendors (450 to 650 gm/sq mete) are accurate and, generally, conservative. But when it comes to HPS vs LED, the attached paper sheds some light on...
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    To prune/lollipop or not…

    I've grown auto and photos but I only started in 2021 so I did grow autos "back in the day". I see zero difference between autos and photos in terms of how to maintain them. I've had monstrous autos and one of the reasons I have switched to photos is that I can't control the height of an auto -...
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