DIY LED Grow Light Vero 18 (Economy light)

I should add that the "white" outdoors is high cri just like the cobs but there is a shift in spectrum strength through the seasons.

I read about one guy who was hitting his plants with IR 30 minutes before lights on to promote growth. He said it mimicked the warmth at dawn as the sun comes up.

churchhaze said:

One thing people with 730nm leds will agree on is that they cause crazy stretch if on during the day.

The results there have been fairly consistent.

I've also tested pulsing 730nm periodically throughout the night to see if it would inhibit flowering, and it actually did. It caused a crazy amount of stretch, and did not start flowering. From this, I concluded that while 730nm lowers Pfr/Ptot , it doesn't lower it all the way, but only to about 0.05. In order to get to 0, it needs darkness.

In other words, don't try anything funny. Just use the 730nm after lights out. Not before, not throughout the night, not on right before lights on, but only after lights out.

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That's the kind of advice I like hearing Churchy.

Rep +++

Mohican said:

I read about one guy who was hitting his plants with IR 30 minutes before lights on to promote growth. He said it mimicked the warmth at dawn as the sun comes up.

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I wonder if there is any merit to his hypothesis and trial. Do infrared give off more heat than other spectrums? Your talking about heat correct?

660 nm changes the phytochrome state and wakes a plant up.

captainmorgan said:

660 nm changes the phytochrome state and wakes a plant up.

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I did not know this

Yes - IR is heat

PSUAGRO. said:

I thought about this too and a was a big proponent of passive cooling..............but was corrected by EH that even cheap modern computer fans have around .1% failure rate. The driver has a way higher chance of burning up.

the pros($$$) outweigh the cons with active cooling in builds imo

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Large passive heatsinks will glow for a long time in the infrared after lights out. Maybe that has a benefit as well?

Mohican said:

Yes - IR is heat

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I'm under the impression that IR does not produce heat but that IR radiation does.

So maybe what your trying to tell me is that IR LEDs produce IR radiation and therefore allows for heat to be transferred to the plant, simulating the sun's release of energy.

IR is heat. When Newton was measuring the temperatures of the spectrum he was surprised when the thermometer past the visible red was hotter than the one with visible red light shining on it. When UV hits glass it is converted to IR. EMR = Electromagnetic Radiation. It is all radiation



Taken from Wiki

Cheers,
Mo

Plants and humans bouth give off ir. I have a strong intrest in ir photography. Some great pics out there.

Mohican said:

IR is heat. When Newton was measuring the temperatures of the spectrum he was surprised when the thermometer past the visible red was hotter than the one with visible red light shining on it. When UV hits glass it is converted to IR. EMR = Electromagnetic Radiation. It is all radiation

Taken from Wiki

Cheers,
Mo

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I can't say that I know more about this subject than Newton but what I'm trying to say is is that Infrared, when discussing the wavelength spectrum, is merely a spectrum or description of a portion of the light spectrum, no different that UV(A,B,C). If there was something special about 600nm, it may have it's own name like OrangyRed but it's no more special than blue or green.

The experiment that Newton exercised sounds a lot like what William Herschel tried. And I'm going off Wiki as well.

As much as I know, Infrared Radiation, which is emitted by the sun, as well as human beings (and most, if not all living things such as plants), is the heat that were both agreeing on exists but you contest that IR is heat, where I'm proposing that IR is a light spectrum and that IR radiation is the source of heat.

I feel like were getting somewhere with this my friend

The strange thing is that while the sun and humans both carry IR radiation, which can be seen with tools, only the sun emits IR light. We obviously don't emit IR light like the sun does but yet we each possess IR radiation, or heat, when using and looking into specialized telescopes or goggles.

AquariusPanta said:

The strange thing is that while the sun and humans both carry IR radiation, which can be seen with tools, only the sun emits IR light. We obviously don't emit IR light like the sun does but yet we each possess IR radiation, or heat, when using and looking into specialized telescopes or goggles.

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No. IR light is IR radiation. They are the same thing. Read about some blackbody radiation. Also, photons are not heat, but when absorbed by a material, their energy is converted to heat.

AquariusPanta said:

I can't say that I know more about this subject than Newton but what I'm trying to say is is that Infrared, when discussing the wavelength spectrum, is merely a spectrum or description of a portion of the light spectrum, no different that UV(A,B,C). If there was something special about 600nm, it may have it's own name like OrangyRed but it's no more special than blue or green.

The experiment that Newton exercised sounds a lot like what William Herschel tried. And I'm going off Wiki as well.

As much as I know, Infrared Radiation, which is emitted by the sun, as well as human beings (and most, if not all living things such as plants), is the heat that were both agreeing on exists but you contest that IR is heat, where I'm proposing that IR is a light spectrum and that IR radiation is the source of heat.

I feel like were getting somewhere with this my friend

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all light is radiation. via photons...

If the ir radiation and ir light are the same energy moving at the same wavelength that makes them the samething to the best of my knowledge.

Ha ha three of use where typing the samething

mc130p said:

No. IR light is IR radiation. They are the same thing. Read about some blackbody radiation. Also, photons are not heat, but when absorbed by a material, their energy is converted to heat.

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Ok so people and things, such as plants or the sun, emit IR radiation or otherwise heat correct? This is necessary for thermal imaging to function yes?

So the sun sheds its light, spectrums such as UV-IR upon our world, and we in return collect that light and as we collect it (as photons?), it is transferred into heat yes? The heat that we absorb and carry is radiation or otherwise heat yes?

I'm glad your all here to better my understanding of this matter

To be fair, all of our understandings