The_StonedTrooper

Welcome to 420SA Make yourself at home and buckle up for the ride As @CreX said, definitely follow his advice

Perfect brother, maybe a little closer but it's okay for now.

Always, here to help, and happy to be of help.

You see @CreX those damn lying RH meters Your Hygrometer isn't giving actual humidity and it can be dangerous if you have any temp drops below 10deg difference and dont have an eye on things unfortunately

As mentioned earlier... Waiting to find that video still,

I'm really trying to find that other video though. The way he explains it, you are like at 25deg and have say 50 RH, which is perfect. But if that temp went up or down by 5deg, cant recall now, it was badly out and you'd get WPM fast. That's why I run my dehumidifier all day at a set humidity, regardless of the RH shown, I follow the VPD method and think I came across the video learning about VPD.

3 out of 15 doing it, and others are happy and healthy and all the same strain, and they have been happy till now and the only thing that changed, is the pots, then its the transplanting.

It appears his plants are happy before, and happy still with new growth. More so from the transplanting has there been something to worry about is my guess. Plus his other plants, remaining of the 15, are healthy, which points to the transplanting Though you never want hot soil to start with, and I also avoid those slow release fertilizer balls, they can be bad news.

The Bruce B video... See if i can find the other one later on, Whole video is good, but if after the Humidity only, it's around 9.00 mark or slightly before for the start of that segment. I watch so many lectures, talks and other shit, and steal with my eyes and ears.

See how information is key to solving these There is your issue, and would say hit it with a soaking of water and check if any sinkholes happen, which likely will. And fill them in with soil. Then carry on as normal

Have seen when transplanting, and not watering properly after or not packing the soil tight enough around the root on the new pot, causing air pockets in the soil and doing that.

Each of those will need a different height, so up to you, as you can use the lowest watts at a closer distance, or the bigger further away, all depending on the area you need to cover or height restrictions or power budgets you may have. You need to test it or give more details of the lights and so

Yes sir, or it will stretch

There is an extremely good video explaining all that, I just cant recall if it was Bruce Bugbee or Harley Smith and have found the one video of Bruce / Apogee Instruments, where he explains it, but it's not the video I recall watching which had it explained better. I can link it here if you like, and only try help when I give advice or share with people.

Can easy be transplant stress if you have caused any damage to the root in doing so, you could not even realise it happened, also seen plants do that from transplant and watering issues.

Though... We could be here all because of genetics as you never what pollen made your babies seed and what these seeds got from mom. I've had kak experience with bag seeds and so happy my next grow is bought seeds. Day and night difference.

They love a good conversation, keep it up Going to go out on a limb and say... Even though I normally advise against salts, it can be argued that they are made up organic matter anyway and that's not why we are here lol. Try Magnesium / Epsom salt next feeding, Or even as @Prom has said, to much Nitrogen. Reason: there could be an excess of one nutrient (nitrogen) is due to the root not having enough of another (magnesium), causing roots to uptake too much of another nutrient (nitrogen) and causing locking out another nutrient (phosphorus) because of it. Can be wind burn too, but you'll know better the wind it got, they can take a breeze or more so.

I definitely need to explain it better haha, Made an example with the difference of 50 to 100. But my dehumidifier and my HTC2 are never the same. Your temp and humidity display, will show relative humidity, which is never true humidity, but the humidity of that specific temp which its currently showing. Walking into my room, the temperature gauge showed temp of 26.4 with a 55 RH and my dehumidifier 43. After 10min the temperature was 25.7 with an RH of 49. Still showing 43 on my dehumidifier. The 2, will never be the same unless you keep adjusting the dehumidifier to be closer throughout the day, when you can rather set it at 55 and forget it, and it will turn on and off regardless. You can have as high as 70 humidity, and still showing 50 RH if the temp was right.

Actual vs Relative Humidity

There is also a difference between RH and Humidity. RH is relative humidity, to the temp on that same display or meter. Humidity, is what you'll see on a dehumidifier, it will show the true humidity, vs the relative humidity and nothing to do with temp. So you can have 50% RH @ 27deg and still have "for example" 100% humidity in the room. Very easily. Sorry to confuse this more

Actually, wind burn is a very likely cause too. Are they in the wind or cold air? Added: please more details, what strain, bag seed or bought, and so on...

I'm going to say, more than likely Sulfur or Phosphorous Excess, or possibly even Potassium Deficiency. You giving Magnesium/Epsom Salts? To often could cause it. And add bloom nutrients for the Potassium D. Could do with more details, watering and nutrient schedule and so...

Correct me if I'm wrong, but if only veg switch was on, then shouldn't half the lights be on all across the board, not only half of half?

Second this, and he will advise you best on the amount or type to use for best results. Driverless LEDs waste electricity in the form of heat as said above.

I'm going assume here, with a little electronics knowledge, and say either a driver gone out or a circuit out, but wouldn't have thought that light would have had 2 drivers and or circuits. Can you or do you want to open it?