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[MiGrampa]

What was mentioned on MARS HYDRO lamps?? I'm using the evo4800 smart light by mars... are their products no good i always used a tsw2000 for a few years then last year upgraded to to evo led light? Have these gott a bad review?

Mars hasn't been known for good quality over the years. It's possible they are offering better quality these days, but I don't know that for sure. The only thing I have by Mars Hydro are 2 sets of 440 blues/660 reds. I have been happy with them so far, but I haven't had them long. They have to still be working for me a couple of years down the road for me to say anything about its quality.

 

[MiGrampa]

Whats the correct Vdp range to use when lights are off? As humidity raises?

Personally? I try to keep it as close as I can to the correct VPD parameters. This usually means my fan runs on high during the full lights off period. There's been many nights where I would call this a "best effort" because it can be hard to get ahead of the humidity during lights out. I have also used an oil filled electric heater on the outside of the tent to raise temperature and fight high night time humidity. I'm also using a dehumidifier in the room with my tents so my tents are intaking drier air.

 

[gtb]

Yeah this is where I'm having troubles trying to get night time humidity down of i use my dehumidifier my temps raise to much?

 

[gtb]

I'm having issues lowering humidity any lower then 65% at nights with temps at 21-22c (70-72f) so vpd is well out of track

 

[MiGrampa]

Yeah this is where I'm having troubles trying to get night time humidity down of i use my dehumidifier my temps raise to much?

How much of a temperature rise are you speaking of? I'm mid flower and I'm "OK" with a night time temp around 73F or approximately 23C if it means I can keep my humidity under control.

 

[gtb]

Im now preflower stage week 2, stretching period my temps sit around 22 with humidity at 65%

 

[Aqua Man]

Yeah this is where I'm having troubles trying to get night time humidity down of i use my dehumidifier my temps raise to much?

At or below daytime humidity…. Plants transpire very little when not photosynthesizing which they only do during lights on. So humidity is not nearly as important over the dark period. But you increase your risk of condensation and pathogens the higher the humidity is…. Ideally 10% below daytime time

If you can program you temps to drop slower the humidity won’t spike as hard. RH (relative humidity) is just that… humidity is relative to temperature .

So if you have the sane amount of water in the air as temp goes down humidity goes up and vice versa.

So you can keep night temps the same as days to keep humidity in check.

Increase air exchange at lights out for a few hours.

Slow the temp drop so a dehumidifier can keep up with the change.

There are many ways to skin a cat

 

[Aqua Man]

I linked this before but you really should take the time to read it.

VPD (Vapour Pressure Deficit) Explained by Aqua Man

WHAT IS VPD: VPD stands for Vapor Pressure Deficit. All gases have vapor pressures, but when we’re growing, we’re interested in water vapor. Vapor pressure deficit is the difference between the pressure of water vapor in 100% saturated air at a given temperature (basically a leaf’s vapor...

budbuilders.org

 

[Tremojem]

What was mentioned on MARS HYDRO lamps?? I'm using the evo4800 smart light by mars... are their products no good i always used a tsw2000 for a few years then last year upgraded to to evo led light? Have these gott a bad review?

My TS3000 had wiring issues that resulted from poor manufacturing practices. Research on the internet revealed it wasn't isolated. I disassembled my TS3000s wiring harness and found all connections were loose. Here, in the USA, our manufacturing standard for electrical terminations (specifically mechanical)safety is to use a torque requirement on all electrical connections or terminations. It's to ensure that with vibration or movement, these connections do not loosen, thereby creating shorts and fire risks. And we are not even talking about the risky onboard power cable connections with the harness to the board. Which is only a silly little SMT connection. With NO fucking strain relief. This is where the board gets its power from. Yet, it's the worst design out there, for that connection.

Now, as long as you are cognizant of this, just inspect everything and always monitor connections for heat and intermittent failure. Be pro active in your safety inspections of your gear and don't be afraid to be overly cautious.

All Chinese and otherwise cheap or affordable "anything" is susceptible to these risks. Garbage in/garbage out.

My first LED Light was the TS3000. I paid $382.99 for it. After it failed and my research revealed that it wasn't isolated, I went thru the entire light and ensured it was safe to use, I put it away. I then bought a new High Quality LED Light. It cost me almost $1000.00.

You get what you pay for.

Not trashing anybody or anything here. I do not claim to be an authority or that all crap is crap. Just my crap was crap. And some others online had crap. Just sharing my experience. This what got me booted from the other forum.

I am confident all is good. Just me answering your questions about my experience.

 

[Tremojem]

No problems here. My Lung Room has a night time temp and humidity of 66F and 38% RH. I set my tent to 0% RH when the light shuts down for the night. My tent night time numbers are 64F and 42% RH, with a VPD of 1.2, and I am almost ready to harvest.

I am retired. So staying awake until tent goes to sleep, and getting up in the morning when it wakes up, is not a problem with me.

My next investment will be for the ACI AI+ Controller. This might allow for less babysitting. I have not found a better way to remain consistent with my grow in my tent. Consistency is key, especially for Auto Flowers, whom loath any change or stress.

Again, I am still a newbie of sorts and I am confident there is a better way. I fooled with different ways to control environment by using the Controller, but using a VPD Target has worked best.

When viewing the image, all is self explanatory except for very bottom of the image, where it shows a water drop and a zero. That is the icon for my Humidity setting and indicates in real time, the level of humidity being applied at any given time. As low as 0 and as high as 10. At night, you can see that it's 0. Me likey.

 

[Tremojem]

Nah the time a tent is open to check leaf temps will not change leaf temps… air temps yes but leaf temps are impacted by root temps, air temps, light, wind etc.

Think of it this way stick a thermometer in the middle of a 1 gal pot and open your tent for 20 min will the temp change? Not a bit

Air temps are influential over time not immediateman!

Just to follow up. You are most definitely correct my man!

I trust your experience and recommendations and had to take another look, based on your statement regarding the capacitance of a leaf verses the capacitance of a pot of soil in regard to the ability of either to hold on to a temperature for any given length of time while experiencing varying temperatures introduced to the space, in an extremely fast rate.

Additionally, your statement about the sources responsible for leaf temperature (root zone etc.), which oddly contradicts with the statement at the end "air temps", which incidentally, I proposed as a source of confusion on how one could take an accurate accounting of Leaf Temperature in a tent without having to account for the extreme changes taking place very rapidly, while collecting data.

Sooooooo... to further support your posit, that opening the tent and exposing your leaves to a Lung Room temperature that is possibly 6 to 8 degrees less than your tent or Leaf Temperature, I did a little investigating. Here is what I observed.

Tent temperature is 74.4F
Lung Room temperature is 66F

Tent Leaf Temperature immediately after opening tent is 73F, on many leaves in many varied locations on two plants in tent. Time taken to gather data was less than 10 seconds. No observation of temperatures falling until around 20 seconds into investigation.

Tent Leaf Temperature at 30 seconds into test is 68F

As long as you collect the data in less than 20 seconds, you are good to go. No one should have a problem gathering this data. Now I gotta look into a better IR Gun.

If you hadn't responded to me, I would never have had the inspiration to perform such an investigation. Thank you sir!!!!

You are fucking right on point!!!

 

[Aqua Man]

Just to follow up. You are most definitely correct my man!

I trust your experience and recommendations and had to take another look, based on your statement regarding the capacitance of a leaf verses the capacitance of a pot of soil in regard to the ability of either to hold on to a temperature for any given length of time while experiencing varying temperatures introduced to the space, in an extremely fast rate.

Additionally, your statement about the sources responsible for leaf temperature (root zone etc.), which oddly contradicts with the statement at the end "air temps", which incidentally, I proposed as a source of confusion on how one could take an accurate accounting of Leaf Temperature in a tent without having to account for the extreme changes taking place very rapidly, while collecting data.

Sooooooo... to further support your posit, that opening the tent and exposing your leaves to a Lung Room temperature that is possibly 6 to 8 degrees less than your tent or Leaf Temperature, I did a little investigating. Here is what I observed.

Tent temperature is 74.4F
Lung Room temperature is 66F

Tent Leaf Temperature immediately after opening tent is 73F, on many leaves in many varied locations on two plants in tent. Time taken to gather data was less than 10 seconds. No observation of temperatures falling until around 20 seconds into investigation.

Tent Leaf Temperature at 30 seconds into test is 68F

As long as you collect the data in less than 20 seconds, you are good to go. No one should have a problem gathering this data. Now I gotta look into a better IR Gun.

If you hadn't responded to me, I would never have had the inspiration to perform such an investigation. Thank you sir!!!!

You are fucking right on point!!!

Did you have fans running in there while doing this?

Remember all things that affect leaf temps need to be taken into account. Light, wind, air temp, humidity (transpiration), media temp etc.

Its not that they can’t change quickly but rather if you are just opening the tent to take readings its highly unlikely.

But say if you have fans blowing cold air in quickly directed at the leaves thats going to make a difference much more quickly

 

[Tremojem]

Fair point.

Baseline testing requires the same conditions to exist in all test sites.

When tent is opened, the only change to the environment is the introduction of changes from Lung Room to tent.

Meaning, I am not purposely introducing increased air turnover. I am not trying to effect the results. I am simply making observations based on user scenarios.

The claim that opening the tent, to take Leaf Temperature, does not affect the data is true.

You are most correct.

Just gotta do it fast, no worries here.

 

[Aqua Man]

Fair point.

Baseline testing requires the same conditions to exist in all test sites.

When tent is opened, the only change to the environment is the introduction of changes from Lung Room to tent.

Meaning, I am not purposely introducing increased air turnover. I am not trying to effect the results. I am simply making observations based on user scenarios.

The claim that opening the tent, to take Leaf Temperature, does not affect the data is true.

You are most correct.

Just gotta do it fast, no worries here.

Under normal conditions (loose definition there)… but as you have shown they can change relatively quickly under some conditions.

Its a good point and like most statements in Cannabis a blanket statement doesn’t fit. For some it maybe 20min and for others like you i could be 20sec

It was a good question to bring up and follow up on.