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making a growlamp using green leds

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making a growlamp using green leds

m3vuv 81 Replies 6,381 Views
Page 4 of 5 · Replies 61–80 of 82
#61
Ninjadogma said:
Just with the extra UV output from a grow light you can see things going on with the leaves you don't see in sunlight. And the sun illuminates things... like bugs... that you don't always see under a grow light.
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There is a lot we dont see. Polarized lenses can reveal new things as well. I saw where a new species of fish was discovered because to our naked eyes it looked the same as another species, but with polarized lenses it has stripes which the other fish species doesn't have.
 
#63
User2 said:
It's an analogy, use your head and common sense. People are also effected by photoperiodism, dark/light cycles. Its s known form of torture to keep people (and plants) under bright lights 24/7. By obsessive focus on light, the understanding of dark is neglected. Anyone with common sense can realize plants have evolved with darkness. It's not their enemy. They rely on it.
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The analogy still doesn't work. Your full of shit.
 
#66
User2 said:
Try butt.
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All I got was this...
Screenshot 20250403 125531
 
#68
Oldchucky said:
Yeah, the UV doesn’t illuminate caterpillars! But it illuminates their damage! I’ve never had a grow light, so I’ll take your word for that one! And caterpillars are hard to spot even on a bright day with my eyes! Lol! Fortunately, I don’t have much of a problem with them or mold!
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Hopefully I've seen my last bud worm. I built a screenhouse to keep them away. May 14 I'll stop bringing them in at night for supplemental so that's when I plan to pick up some ladybugs and throw them in there. Last Summer I had a good population of mantids guarding my grow. Hoping they return this year. They also look unremarkable under UV.
 
#69
I hadn't read this thread till today. I can't say I have much reason to replace the full-spectrum lights I have, but I am looking forward to future light technology. I appreciate the information provided by the well-intentioned farmers. In particular, I found this comment intriguing:

Grownsince95 said:
I see this in my own grow with a UVb light. The plants purple up more in an attempt to reflect that light away from the plant. Fascinating stuff indeed.
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I had considered the reflectance factor in relation to the purple pigment. I have one light that creates a lot of purple but also produces fine weed. It's an AC Infinity S22 in a 2x2 tent. I've read that purple pigmentation can be protective as well as being a response to stress. I had not, however, considered the spectrum-specific aspect of the color. An interesting idea. Thanks. Are there theories about how or why reflectance of that part of the spectrum is beneficial or necessary?
 
#70
So much easier if you just post all this science for us lame retawds.....shoot us about 6 really good pictures of your wicked garden of perfect plants too Please!! Cheers 🍻
 
#72
LoveGrowingIt said:
I hadn't read this thread till today. I can't say I have much reason to replace the full-spectrum lights I have, but I am looking forward to future light technology. I appreciate the information provided by the well-intentioned farmers. In particular, I found this comment intriguing:


I had considered the reflectance factor in relation to the purple pigment. I have one light that creates a lot of purple but also produces fine weed. It's an AC Infinity S22 in a 2x2 tent. I've read that purple pigmentation can be protective as well as being a response to stress. I had not, however, considered the spectrum-specific aspect of the color. An interesting idea. Thanks. Are there theories about how or why reflectance of that part of the spectrum is beneficial or necessary?
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Yes because uv radiation is the most harmful to the plant. That's why we add UVb to our grows. Trichomes and anthocyanins (purple) are what protect the plant from uv radiation which to us looks so dark purple until we can't see it. Same on the other end with red.
 
#73
This is a plant that never ever gets purple on its own and got burned by UVb light because I'm a dumbass.
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It's a protection that evolved to reflect the wavelength away. Plants don't see light they feel it. I think that weed that gets purple on its own is just more sensitive to it and maybe all of them are at the end of their life so they make more idk. This happened peak flower though, not at the end.

That little harmless looking blue light does wicked damage
 
#74
Grownsince95 said:
Yes because uv radiation is the most harmful to the plant. That's why we add UVb to our grows. Trichomes and anthocyanins (purple) are what protect the plant from uv radiation which to us looks so dark purple until we can't see it. Same on the other end with red.
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So, that leaves the plant with whatever parts of the spectrum remain after subtraction of green and UV wavelengths. That could be how the same or a similar pigmentation response relieves stress, with the implication that plants may be constantly defending themselves against the reflected wavelengths but might need an assist when under stress.

Grownsince95 said:
It's a protection that evolved to reflect the wavelength away. Plants don't see light they feel it. I think that weed that gets purple on its own is just more sensitive to it and maybe all of them are at the end of their life so they make more idk.
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Reasonable.
 
#75
LoveGrowingIt said:
I hadn't read this thread till today. I can't say I have much reason to replace the full-spectrum lights I have, but I am looking forward to future light technology. I appreciate the information provided by the well-intentioned farmers. In particular, I found this comment intriguing:


I had considered the reflectance factor in relation to the purple pigment. I have one light that creates a lot of purple but also produces fine weed. It's an AC Infinity S22 in a 2x2 tent. I've read that purple pigmentation can be protective as well as being a response to stress. I had not, however, considered the spectrum-specific aspect of the color. An interesting idea. Thanks. Are there theories about how or why reflectance of that part of the spectrum is beneficial or necessary?
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I’m sure Bugby has done something on what you’re looking for! He also addresses the UV effect! And which parts of the spectrum affect plants in certain ways! Just takes a lot of time to find it!
IMG 4259
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#76
He’s probably got stuff on there that would help the OP out with designing his lights!
 
#77
LoveGrowingIt said:
So, that leaves the plant with whatever parts of the spectrum remain after subtraction of green and UV wavelengths. That could be how the same or a similar pigmentation response relieves stress, with the implication that plants may be constantly defending themselves against the reflected wavelengths but might need an assist when under stress.


Reasonable.
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They're not defending against green. It's in the middle of the spectrum where you want to be if you need to soak up red and blue and not reflect them back into space. The extremes out on the ends are bad... uv and infrared. Can't reflect either tho and far red is essential...go figure.
 
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#79
Oldchucky said:
I’m sure Bugby has done something on what you’re looking for!
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I am familiar with his work.

Grownsince95 said:
They're not defending against green.
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Okay. A poor word choice. Either way, whether reflected or defended, it's generally agreed that green wavelengths aren't used much by the plants. In which case, the green color could simply be due to the chemistry of chlorophyl and lacks any other significance. (I forgot for a moment that chlorophyl is green.) Is it a safe assumption that the plants might have evolved greater sensitivity to other parts of the spectrum to accommodate the loss of the green part?

Aaawww... Never mind. This last Kush we harvested, the one with a lot of purple, is splendid. Thanks for the brain work.
 
#80
Here's a quick breakdown of light spectrum and the way I like to think about it.

Plants use all the visible spectrum (and some invisible to us) for life processes that can be independent from photosynthesis.

Red and blue light work in tandem to control circadian rhythms and biological processes within plants through phytochromes, cryptochromes and phototropins.

Every day on earth, because of our atmosphere, the day begins and ends "red" while the middle of the day is "blue." (If you were a plant)

In conjunction with darkness plants have adapted to be able to read these external stimuli to control seasonal growth and regulate important life processes.

Interestingly enough, recent research suggests that there might be cryptochrome independent mechanisms for green light perception. For example, green light has been shown to promote hypocotyl elongation in some plants through a pathway that doesn't involve known photoreceptors but does involve the brassinosteroid signaling pathway. This hints at the possibility of unidentified green light sensing components in plants.


This is 15 year old research and yet here we are arguing about it like we know better. Because we took a very nuanced subject that is not fully understood and tried to make it a black and white issue about growing weed.

As humans we have a hard time with things we don't fully understand and like to put everything in neat little boxes. It doesn't always work that way.
 
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