HPS heat vs led heat

Kingrow1

Well-Known Member
There is a ton of info at Michigan state university.

They have been testing individual colored diodes and specific crop growth for a few years now.

There is no plan to continue using hid for the future in agriculture.

Cmh is kinda late even though the university of Utah says it has the best full cycle sunlight like spectrum for plant growth at this time.

Phillips 315 3100k specifically.
Neither led cmh or hos are the future of the agri business, we are on the verge of making other tech work much better but as yet it hasnt become cost effective or safe. Leds and cmh are merely the present.

Many dispute michigan st uni and some go futher to point out they have been at the front of a whole lot of bad advice over leds, there a few threads around and even more that have just simply lost faith.
 

Kingrow1

Well-Known Member
That's a really interesting take, I think I agree. My question is what happens if you use the higher temps to get the bigger bud development but then lower the temps for the last couple weeks of finishing? Quality still lower?
Buds are the sum of the grow, very little changes in a week or two.

His advice on light and heat with led and hps is solid though, nothing that im not sating :-)
 

MichiganMedGrower

Well-Known Member
Neither led cmh or hos are the future of the agri business, we are on the verge of making other tech work much better but as yet it hasnt become cost effective or safe. Leds and cmh are merely the present.

Many dispute michigan st uni and some go futher to point out they have been at the front of a whole lot of bad advice over leds, there a few threads around and even more that have just simply lost faith.

No. They are testing on grants from huge corporations which will then commission custom lighting for major food production.
 

Johnny Lawrence

Well-Known Member
Its there on google now, i just checked for you....

Go type 'green light chlorophyll' on google now and scroll through the first twenty pages reading anything on wiley or ncbi or any cited site that scientists use to cite experiments and results type stuff.
Hurry over to google before it dissapears and gives you broscience led manufacturer results :-)
Hahhahahahaha!!!
 

dubekoms

Well-Known Member
Its there on google now, i just checked for you....

Go type 'green light chlorophyll' on google now and scroll through the first twenty pages reading anything on wiley or ncbi or any cited site that scientists use to cite experiments and results type stuff.
Hurry over to google before it dissapears and gives you broscience led manufacturer results :-)
Lol the one growing spinach or the one growing sunflowers?
 

Tim1987

Well-Known Member
Know what i find interesting here though....
Not siding with either side. But just some statistics.

Upon a google search, and according to the University of Tennessee the sunlight at the Earth's atmosphere is 1366watts / m2.
Is comprised of 50% infrared light, 40% visible light, and 10% UV.

Wouldnt the golden standard to attempt to achieve be sunlight?
After all, plants have evolved to grow optimally under the sun.

Why wouldnt plants adapt to use infrared as well?
Just because they can't "see it" to photosynthesize, doesn't necessarily mean they havn't evolved to take advantage of it somehow...

We are always attempting to replicate the suns energy. Its the golden standard.
Why wouldn't infrared be important here?
Its all part of environment isn't it?

:peace:
 

Lucky Luke

Well-Known Member
Know what i find interesting here though....
Not siding with either side. But just some statistics.

Upon a google search, and according to the University of Tennessee the sunlight at the Earth's atmosphere is 1366watts / m2.
Is comprised of 50% infrared light, 40% visible light, and 10% UV.

Wouldnt the golden standard to attempt to achieve be sunlight?
After all, plants have evolved to grow optimally under the sun.

Why wouldnt plants adapt to use infrared as well?
Just because they can't "see it" to photosynthesize, doesn't necessarily mean they havn't evolved to take advantage of it somehow...

We are always attempting to replicate the suns energy. Its the golden standard.
Why wouldn't infrared be important here?
Its all part of environment isn't it?

:peace:
I suppose its the same with Colours. Different species of animals see colour spectrum differently.
 

Tim1987

Well-Known Member
I suppose its the same with Colours. Different species of animals see colour spectrum differently.
Its interesting isn't it. Just makes me think about.
For instance the plants cant see UV light, but it has been proven lately that UV can increase thc and resin. Maybe resin protects the plant from uv exposure? But it can all have such a domino effect.
Its a very mysterious world. Things science and people like ourselves still haven't been able to completely understand.
 

growingforfun

Well-Known Member
Theres tests showing plants grow better without ir. Cant source em, but I've seen em on TV. They could be flawed, but just letting us know what I've seen
 

Overgrowthegov

Well-Known Member
Theres tests showing plants grow better without ir. Cant source em, but I've seen em on TV. They could be flawed, but just letting us know what I've seen
I have a camera in my grow room that has IR for night vision but the spectrum is 940nm and so it doesn't disturb flowering. It didn't seem to bother the growth last round, but what you say is interesting.
 

Tim1987

Well-Known Member
Theres tests showing plants grow better without ir. Cant source em, but I've seen em on TV. They could be flawed, but just letting us know what I've seen
Its a very mixed debate isn't it.

The thing i wonder about though. Is do all plants take advantage of infrared radiation for warmth possibly?
Would the warmth of the sun, and temperature of the ground be an indication of seasonal change for a plant?
Obviously not to imply plants can think. But adapted for optimal reproduction rates, and survival for sure.
 

Overgrowthegov

Well-Known Member
Buds are the sum of the grow, very little changes in a week or two.

His advice on light and heat with led and hps is solid though, nothing that im not sating :-)
Anyways guess I will find out for myself room temps are 85 right now and will flip to 12/12 in a week, then 10 weeks for these two sativa strains. That puts me into the end of Sept with hopefully cooler night temps (day time for the plants) for the last few weeks.
 

ttystikk

Well-Known Member
Your exscusing how to grow for leds being aparently cooler and assuming mere heat drives photosynthesis the same as ir and light radiation which it simpky dosent.

Taking liberties with the assumption ir and heat are the same to a leaf, ir drives leaf internal temps past air temps all day long and is a much bigger convversion on energy than mere heat.

Check the svience, your quoting led copy and paste on ir not what reseach shows.
No. I'm citing the personal experiences of dozens, even hundreds of growers. If LED wasn't more efficient, word would have gotten around.

In the early days of LED, people tried the blurple units and found they did not perform to expectations. Modern full spectrum LED lights are far better and more efficient for reasons that are well known to us here on this forum and to manufacturers.

There simple fact is that you're wrong, biased and losing credibility because you can't back up what you say with evidence of any kind.

If you want to go on growing under HID that's fine, no one is stopping you. The problems start when you attempt to act as an authority on technology and techniques you very clearly don't know anything about.

Just so there is no misunderstanding; I have no problem with you as a person, only your attempts to assert things that are demonstrably not true about LED lighting and its application in horticulture.
 

CCCmints

Well-Known Member
There is a ton of info at Michigan state university.

They have been testing individual colored diodes and specific crop growth for a few years now.

There is no plan to continue using hid for the future in agriculture.

Cmh is kinda late even though the university of Utah says it has the best full cycle sunlight like spectrum for plant growth at this time.

Phillips 315 3100k specifically.
Interesting. Why are they saying that?
 
Top