Winter Weedy Wonderland - Auto Grow - Royal Queen Seeds

[Gee64]

Here is a Brix post,
and here is a VPD post.

The VPD post isn't really a detailed post, more of some examples explaining the pitfalls of VPD that is out of range.

I have written some pretty comprehensive VPD posts in the past, perhaps @Azimuth has bookmarked one?

 

[Gee64]

Yes, that's what I thought it was when I ordered it.
The description says first of it's kind to measure 5 in 1 climate readings and calculates true Leaf VPD. I read that to mean I wouldn't have to do any manual calculations.
This chit is so foncusing.
I have it in the grow room, but if I need it near the plants I can do that too.

Ok cool, these are new on the street, I'd love to see one in action. Does it link to an app?

If you have other ways of knowing your air temps and RH at canopy level, such as a hygrometer, we can compare results to doublecheck the new toy. If you can hang it at canopy level so temp and RH are accurate before you zap the leaf, that will give you the most accurate reading.

 

[Lady Cannafan]

Ok cool, these are new on the street, I'd love to see one in action. Does it link to an app?

If you have other ways of knowing your air temps and RH at canopy level, such as a hygrometer, we can compare results to doublecheck the new toy. If you can hang it at canopy level so temp and RH are accurate before you zap the leaf, that will give you the most accurate reading.

I have a hygrometer in the room right next to the plants platform, so that's doable. When I looked into this unit, I felt it was a do-all, so went with it.
I am going to read the manual entirely later, and then play with it. I don't know if it links to an app yet.
I can't do it right now, I fell this morning and the pain in my back and arse is pretty bad making me not think so goodly. LOL
I'm sure I will have some questions tomorrow and I will go through your write ups later too.
Thanks a bunch!

 

[Gee64]

I have a hygrometer in the room right next to the plants platform, so that's doable. When I looked into this unit, I felt it was a do-all, so went with it.
I am going to read the manual entirely later, and then play with it. I don't know if it links to an app yet.
I can't do it right now, I fell this morning and the pain in my back and arse is pretty bad making me not think so goodly. LOL
I'm sure I will have some questions tomorrow and I will go through your write ups later too.
Thanks a bunch!

That IS a pain in the arse lol. Sorry, not funny but funny. I hope you heal.

I'm around all the time so tag me if you need any help. It will be cool to see the new toy in action.

Can you hang your hygrometer at canopy level, things change a fair bit throughout the tent.

 

[Lady Cannafan]

That IS a pain in the arse lol. Sorry, not funny but funny. I hope you heal.

I'm around all the time so tag me if you need any help. It will be cool to see the new toy in action.

Can you hang your hygrometer at canopy level, things change a fair bit throughout the tent.

Sorry, I thought you knew. I'm not using a grow tent. This is a spare bedroom closed off being used for the grow. Out in the open, not confined to a tent space.

 

[Waywardwayne]

This isn’t complicated relax, you can use it right away and be sure it’s right.

Lets run through the calibration first.

Step one, do you have a way to measure all of these things separately from the device?

That’s what you need to calibrate it. You would measure room temp and see if the gun matched.

If it doesn’t then you press the middle button a few times (after firing the weapon so the screen turns on. Pressing this middle button effectively scrolls through the available calibration settings.) and look at the top, get your glasses on it’s very small, it’ll say “calib T” you simply press up or down to match the reading of your external thermometer you are calibrating to.

Each thing can be calibrated the same way.

EMS - this is set to .98 for cannabis. If you wanted to measure the surface temperature of you bedroom wall you would change that value to work with that material instead. The device comes set to .98 so don’t worry about that.

F or C - your preference.

Calib H - rh%

Calib leaf T - calibrate leaf temp. You’d have to have another ir gun to calibrate against.


If you get really familiar with these settings you can use the rh% and room temperature offsets to store the gin elsewhere but still get accurate readouts. As long as you use your other sensors to calibrate against, that are already in the room/tent.

Once it’s calibrated you only have to double check its accuracy, not calibrate every use. I’ve had this same weapon since around the end of November and love it.

I’d be happy to go over any of this again I know my presentation if very sloppy.

 

[Waywardwayne]

I have the same but I can’t do anything about the environment after a point. So I just use this stuff to monitor.

 

[Gee64]

I have the same but I can’t do anything about the environment after a point. So I just use this stuff to monitor.

So it doesn't dynamically read room temp and RH, they are hard coded values that you must check and possibly adjust in the settings each use?

 

[Waywardwayne]

So it doesn't dynamically read room temp and RH, they are hard coded values that you must check and possibly adjust in the settings each use?

No. They read in real time. But you can calibrate them any time you want. The calibration sticks until it’s adjusted again or set back to the zero offset.

RH and ambient temp is read through the vents on top real time.


* sorry didn’t get the context. I’m the one who can’t do anything about the environment.

 

[Lady Cannafan]

I have the same but I can’t do anything about the environment after a point. So I just use this stuff to monitor.

This isn’t complicated relax, you can use it right away and be sure it’s right.

Lets run through the calibration first.

Step one, do you have a way to measure all of these things separately from the device?

That’s what you need to calibrate it. You would measure room temp and see if the gun matched.

If it doesn’t then you press the middle button a few times (after firing the weapon so the screen turns on. Pressing this middle button effectively scrolls through the available calibration settings.) and look at the top, get your glasses on it’s very small, it’ll say “calib T” you simply press up or down to match the reading of your external thermometer you are calibrating to.

Each thing can be calibrated the same way.

EMS - this is set to .98 for cannabis. If you wanted to measure the surface temperature of you bedroom wall you would change that value to work with that material instead. The device comes set to .98 so don’t worry about that.

F or C - your preference.

Calib H - rh%

Calib leaf T - calibrate leaf temp. You’d have to have another ir gun to calibrate against.


If you get really familiar with these settings you can use the rh% and room temperature offsets to store the gin elsewhere but still get accurate readouts. As long as you use your other sensors to calibrate against, that are already in the room/tent.

Once it’s calibrated you only have to double check its accuracy, not calibrate every use. I’ve had this same weapon since around the end of November and love it.

I’d be happy to go over any of this again I know my presentation if very sloppy.

Thanks so much Wayne! I have another IR gun that measures just surface temps, so I will use that for calibrating. I also have 2 Temp/RH monitors in the room in different areas, and will use the one near the plants as a guide.
Your presentation presented itself very well.

 

[Azimuth]

I have written some pretty comprehensive VPD posts in the past, perhaps @Azimuth has bookmarked one?

The ones below are the ones I have that I can find. Since the latest software update my bookmarks function doesn't work like it used to.

I've lost a lot of my labels that marked the bookmark so I have it marked but can't see it. It used to work really well, but I may try a different way going forward since I'm really starting to dislike it.

VPD Basics

VPD and Leaf Temps

VPD Info

 

[Gee64]

No. They read in real time. But you can calibrate them any time you want. The calibration sticks until it’s adjusted again or set back to the zero offset.

RH and ambient temp is read through the vents on top real time.


* sorry didn’t get the context. I’m the one who can’t do anything about the environment.

Ok thanks Wayne

 

[JiggiLotus]

Sorry, I thought you knew. I'm not using a grow tent. This is a spare bedroom closed off being used for the grow. Out in the open, not confined to a tent space.

that was my question. lol. was does it matter if its a grow room or a grow tent. i would think its harder in a full sized room vs a closed in controlled tent environment.

 

[Lady Cannafan]

I'm going to put a lawn chair in the grow room with some coconuts and drink glasses with little umbrellas. Going from there back out to the rest of the house is like walking from a tropical paradise into an Arctic blast.

 

[Gee64]

I'm going to put a lawn chair in the grow room with some coconuts and drink glasses with little umbrellas. Going from there back out to the rest of the house is like walking from a tropical paradise into an Arctic blast.

I sense a Pic of the Month... jus sayin...

 

[Lady Cannafan]

I sense a Pic of the Month... jus sayin...

I keep hearing Grandma saying "Put a coat on! You will catch your death of cold!" when I leave the room.

Did you get Jiggi's question on tent vs. room? Have any thoughts on that?
Is it pointless for me to do this in a room rather than a tent?

I will be using a grow tent at some point, but not sure when. Certainly not during this grow.

that was my question. lol. was does it matter if its a grow room or a grow tent. i would think its harder in a full sized room vs a closed in controlled tent environment.

 

[con]

I googled it (optimal VPD for indoor cannabis plants) and came up within that range for flowering.

Anybody have an accurate chart I should folla, or what your optimal range is for indoor cannabis growing? I'm new to this.....

I googled it (optimal VPD for indoor cannabis plants) and came up within that range for flowering.

Anybody have an accurate chart I should folla, or what your optimal range is for indoor cannabis growing? I'm new to this.....

this is the one i have been using & the chart on the very bottom will also give you different degrees of air to leaf difference 1f to 5f or celcius depends which ever you use Vapor Pressure Deficit VPD Calculator - Dimlux Lighting - The Best Grow Lights

 

[Gee64]

I keep hearing Grandma saying "Put a coat on! You will catch your death of cold!" when I leave the room.

Did you get Jiggi's question on tent vs. room? Have any thoughts on that?
Is it pointless for me to do this in a room rather than a tent?

No, it's never pointless. When VPD gets too far out of whack deficiencies can arise, so if all of a sudden a deficiency pops up and you can't fix it, lets say an Mg def for example, and adding Mg doesn't help, then at least you may know why.

Also, because VPD is a floating target with 3 variables, it actually can become quite powerful in an open environment.

Lets say that you are in mid to late flower. After stretch has finished and before senescence kicks in. Ideally you want something like this....

But your in an open room and you are dealing with this...

Which will still work OK, but you aren't transpiring as fast as you could be, so nutes are moving slow. Well if you had a humidifier, which is far cheaper than turning the heat up in the entire house, or running a space heater, you could easily get to this....

And now transpiration is rolling full tilt again just by drying the air down a bit.

All that aside, no matter how far out of whack your room is, within reason, VPD in conjunction with the use of the IR thermometer will always allow you to dial your light into your rate of transpiration, so the roots match the shoots, simply by adjusting the light to get to your 2 degree offset.

Combine that with the refractometer revealing the state of your calcium and staying inside the ballpark becomes a lot easier. All you need to do is be in the ballpark, and try to never overlight your leaves, and your harvest will be fine.

Maybe not Plant of the month, but certainly braggable.

You can use the online calculator to run numerous scenarios, find the one that works best to get you into the ballpark, and make the best out of less than perfect conditions.

Your sailing along nicely, and a freak cold snap/high pressure ridge rolls in and RH plummets to this....

VPD spikes. So you turn the light down and leaf temp drops, widening the gap and you end up with this...

Back in the ballpark. Then 3 days later the high pressure/cold snap subsides, VPD plummets as RH climbs, so you dial the light back up...

and your very quickly back in the ballpark and can decide how to jiggle it back to 1.40ish

So you turn on the dehuey again and get to this...

And its Game On again.

Hopefully that made sense. And you can do all this on the calculator before making adjustments to find YOUR personal path of least resistance.

If VPD ever spikes hard, simply turn the light down and figure out a course of action.

If this isn't computing please speak up and we can run it again.

 

[Gee64]

this is the one i have been using & the chart on the very bottom will also give you different degrees of air to leaf difference 1f to 5f or celcius depends which ever you use Vapor Pressure Deficit VPD Calculator - Dimlux Lighting - The Best Grow Lights

Thats a gooder!

 

[Lady Cannafan]

No, it's never pointless. When VPD gets too far out of whack deficiencies can arise, so if all of a sudden a deficiency pops up and you can't fix it, lets say an Mg def for example, and adding Mg doesn't help, then at least you may know why.

Also, because VPD is a floating target with 3 variables, it actually can become quite powerful in an open environment.

Lets say that you are in mid to late flower. After stretch has finished and before senescence kicks in. Ideally you want something like this....

But your in an open room and you are dealing with this...

Which will still work OK, but you aren't transpiring as fast as you could be, so nutes are moving slow. Well if you had a humidifier, which is far cheaper than turning the heat up in the entire house, or running a space heater, you could easily get to this....

And now transpiration is rolling full tilt again just by drying the air down a bit.

All that aside, no matter how far out of whack your room is, within reason, VPD in conjunction with the use of the IR thermometer will always allow you to dial your light into your rate of transpiration, so the roots match the shoots, simply by adjusting the light to get to your 2 degree offset.

Combine that with the refractometer revealing the state of your calcium and staying inside the ballpark becomes a lot easier. All you need to do is be in the ballpark, and try to never overlight your leaves, and your harvest will be fine.

Maybe not Plant of the month, but certainly braggable.

You can use the online calculator to run numerous scenarios, find the one that works best to get you into the ballpark, and make the best out of less than perfect conditions.

Your sailing along nicely, and a freak cold snap/high pressure ridge rolls in and RH plummets to this....

VPD spikes. So you turn the light down and leaf temp drops, widening the gap and you end up with this...

Back in the ballpark. Then 3 days later the high pressure/cold snap subsides, VPD plummets as RH climbs, so you dial the light back up...

and your very quickly back in the ballpark and can decide how to jiggle it back to 1.40ish

So you turn on the dehuey again and get to this...

And its Game On again.

Hopefully that made sense. And you can do all this on the calculator before making adjustments to find YOUR personal path of least resistance.

If VPD ever spikes hard, simply turn the light down and figure out a course of action.

If this isn't computing please speak up and we can run it again.

Well, funny....I couldn't compute when I was in pain this morning. But now that I'm zooted, this makes sense. LOL
Thanks again! I think I may have a plant with some kind of deficiency going on, we will use this to dial in what's up.
This is going to be a nice learning experience.
Looks like my VPD calculation for mid flower is okay at 1.4ish.
But that one plant....I'll work on it tomorrow when I can get the refractometer tests done.

Edit: happens to be the plant that is hit hard with the thrips. F' ing things. Never had them in an indoor grow before.