I have been delving deeper into this...and it does not seem to be quite that clear cut....at least from the "anecdotal evidence" presented by fellow growers...?

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Also there are UV A, and UV C... how come these are ignored?

I believe it is because it is a very narrow range of UV light that has trhe influence over the conversion process. (i.e., 280-315 nm)

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Then what happens to the A and C? We know red (far) light is bounced off, and green is reflected too. So this means all other light would be absorbed into the trich' at the same time... likewise magnified.

Could the chemicals, like MM said, be created to divert the different spectrums? Hence the varying cannabinoids in the first place?

Also the chemical responsible for smell, he makes no mention of that... Ed Rosenthal, put the chemical as THCV... the plants with high levels of this chemical are usually the most potent strains. Could it in fact be the THCV that is created by by one of the UV ranges? THC created by another, and CBD created by the other one?

Hence the reason for the two sets of cells in the trich'.

Also, why would cbd be derived from THC? Maybe THC is derived from THCV, and CBD is derived from CBN. The reason for the two sets of cells, could be to process light from both extremes of the spectrum. The cell responsible for smell (i forget the names now, and scrolling down doesn't reveal enough, sorry) reacts to blue, and the part responsible for cbn reacts to red?

Hope that makes sense.

Like you have mentioned, the ultraviolet region of the magnetic spectrum is divided into three different regions, UVA, UVB, and UVC. These three sub-divisions are rather arbitrary, however, as it seems that most disciplines originally defined them differently and have their own definition of what wavelengths fit in which division. Environmental photobiologists (who I tend to trust because they know plants) tend to define the wavelength regions as: UVA= 400-320nm, UVB= 320-290nm and UVC= 290-200nm. 290nm was chosen as the distinction between UVB and UVC because UVR in the shorter wavelengths are unlikely to be present on Earth's surface, other than at high altitudes . The division between UVA and UVB does seem to be rather arbitrary however, as I have yet to read a definitive explanation. More recently what does seem to becoming clear now, however, is that electromagnetic radiation occurring at wavelengths shorter than 320nm are thought to be generally more active photobiologically than longer wavelength UVR.

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thanks man....for adding this....a good deal of insight to the technical specific here....preciate you pipining in!

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Ride hard, Ride long....git put away Wet each and every time....no holdin' Back.....enjoy the journey ...... cuz that's ALL there is! Walk on and walk tall folks!

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ReptileUV.com is soon to be releasing a metal halide uvb bulb with loads of uvb

I found this link in a quick search. There is some good info in there on what lights produce specific spectrums of UV light.

Reptile Lighting

ive also been looking into this. But where would you put uv light just seems small to cover 10 plants. and where would u put it??? but great thread been lookin for some info and this pretty much says it all...

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Wheres it at.....

thanks tasty aces......the penetration of UVB should be pretty good considering the wavelength...but that is a good question...something more to look into for sure....in my case....I will never have more than 5-6 plants...so its not as much of an issue

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Ride hard, Ride long....git put away Wet each and every time....no holdin' Back.....enjoy the journey ...... cuz that's ALL there is! Walk on and walk tall folks!

"A House Full of Gratitude Has No Place for Fear To Hide"