Cree XM-l Panel... Supplementing 730 and up With Halogen

Rrog said:

All white may be lacking the resin building / finishing potential was the premise. It's why I started this thread.

What I was wondering is when we say Far Red, Near Red, what frequencies of the spectrum does that represent? Is Near Red 600-700 and Far Red from 700-800?

Click to expand...

Trichome production is really interesting, though puzzling subject. Thinking of their function, my thoughts are that they are somewhat a response to a threat (pests, herbivores, radiation etc) and have a strong genetic component to their expression too. "Ripening" of the trichomes is unfamiliar to me, but in nature, UV-light should have some influence to the compounds inside the trichomes? I assume that over expression or lack of other wavelengths will have their influence too, to how much trichomes the plant produces and what happens inside them.

Some of the grows I have observed with led lights having very reddish spectrum seem to produce very frosty plants, almost to the point of ridiculousness. Maybe plant senses the saturating narrow bandwidth light as a threat and reacts by putting out more trichomes? Photons of red wavelength should have the least harming effect towards photosystem damage, so that is quite interesting (yellow & uv are the most damaging, so puzzling!). Maybe there is just some "switch" that reacts to saturated or strong red light? Other possibilities are endless, but with my limited knowledge & experience of leds that is what I wondered.

Maybe you have grown "too healthy" plants with that wide spectrum.

Green- My understanding that any diode may have a deviation. See the spectrum curve associated with any particular diode. It's a range

Anno- In my grows, I have supplemented UV-b for a few years. We see evidence that green isn't as useless as we thought. Ultimately, I think we'll find that the best solution really is a full frequency. So that's where I'm headed. Wash one end in red and the other in blue. WW in the middle.

The trichome resin production will happen but what my friend is seeing is exactly what made me start this thread. The thought that the WW, while fine, does not complete the picture. I was looking for some wavelength-specific solution- add 630, 652, 660, 730, etc. No clear answer, other than my conclusion that there's just not enough red. So without a surgical solution, I look at the Halogen with the huge excessive red.

Quote from link:

"(c)The photoperiodic response is controlled by phytochrome. "Phytochrome is a blue pigment in the leaves and seeds of plants and is found in 2 forms. One form is a blue form(Pfr), which absorbs red light, and the other is a blue-green form(Pr) that absorbs far-red light. Solar energy has 10X more red (660nm) than far-red (730nm) light causing the accumulation of Pfr." The first and last hour of a day's sunlight is mostly red light because of the scattering effect on blue light. "So at the onset of the dark period much of the phytochrome is in the Pfr form. However, Pfr is unstable and returns to phytochrome Pr in the dark." The red light in sunrise returns the Pr to the Pfr form. "Phytochrome Pfr is the active form and controls flowering and germination. It inhibits flowering of short-day plants (the long night period is required for the conversion of Pfr to Pr) and promotes flowering of long day plants."

(d)In Nepal and nearby areas of India where the capitate-stalked glandular trichome is triggered into growth by parthenocarpy rather than by fertilized ovum, great care is taken to make sure that all male cannabis plants are destroyed as soon as they reveal their sex. This is because unfertilized Indica flowering females can have both stigma and anther protruding from the floral bract. In the Indica gene pool, female-produced pollen carries an allele for long-day parthenocarpy, and seeds resulting from this female-produced pollen will produce another generation of female plants that will also exhibit long-day parthenocarpy during flowering. But if pollen from male plants is introduced into this gene pool, the resulting seeds will produce a generation of females that will exhibit short-day parthenocarpy instead. The allele for long-day parthenocarpy in the female-produced pollen is carried into the gene pool by self-pollination and cross-pollination, and perhaps homozygous is used too loosely here to describe the genetic result.

( It appears that the resin sphere acts as an UVB receptor and magnifying lens. The latter apparently lets it gather in a lot more photons than would otherwise be possible; because a lens also acts as a prism, the resin sphere may prevent some wavelengths from being focused where the phytochemical processes are taking place because they could interfere with the phytochemical process that makes THC. "

Interesting reading..

Link: http://www.weedfarmer.com/cannabis/thc_guide.php

That last part about UV reception and magnification is very widely seen as a stoner's opinion. That's my take on it as well. I have seen that opinion used as fact for years. The fact is that all plants have UV defenses, including rapid DNA repair. Based on my reading into this, I am more of the opinion that the resin plays an insecticidal role, as many of the molecules in the glands are similar to known insect neuro-disruptors.

The fact that UV-b or blue in general may have an effect on resin production is a yet unanswered relationship. While the plant may produce more resin with UV, IMHO it does not produce the resin specifically to protect from UV.

most be something to it, if some dispensery have got feedback from user, medicating with plants that have had an certain exposure of uv, and they stop buying weed from grows WHO hadent got enough of the uv in their growing periode... but its a big topic...

this guy altso talks alillte about the effect of uv..[video=youtube;lfiI78uN3Ks]http://www.youtube.com/watch?v=lfiI78uN3Ks[/video]

think i got the link from this forum? fuck it.. im stoned.. he he.

That's the guy that started this. That's the guy that's referenced all the time!!! I love that little show but holy shit

As I said, I supplement UV-b in my grows

okay.. i did not know.. im new here aswell for the uv/infra red talk.. if you close your eyes for 5 min., the technology of led grow light will have done some new discoverys..*lol*

sorry for the bad English.. he he.. ive smoked many joints today... it sounds a bit better in Danish... he he..

Tell you what- I'll show up at your place, you can get me high, and I'll let you know how it sounds in Danish!

Rrog, I wasn't distinguishing between Far Red and IR (still not sure if I'm on the same page). I'm talking wavebands and their physiological effect on the plant. Whether or not it's hitting the nail on the head as far as absorption efficiency goes, I'm not really worrying about it.

So, for me:
Amber/Red = 600-640nm
Deep Red = 640-700nm
Far Red = 700-800nm

Any light that falls within those wavebands mean the same thing to the plant, afaik. Hope that clears up any confusion with my lingo, I feel we're on the same page just using slightly different terminology. Idk.

Thanks for that.