UVB lighting late in flower

cannawizard said:

Good info~ I'm with you on the UVb, it's pretty much been the main focal point of my personal research & experiments~ btw, have you seen any studies or footnotes concerning UVb exposure leading to more CBD% (for CBD strains)-- the enzymatic processes that happen in that tiny sphere(trichomes) is mind bogglin' hehe

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no, actually i haven't in fact ive heard UVB increases thc-v the most. i have to agree, i have a few pet projects, but one mother strain i work with is extremely psychedelic.(love taking a nap after smoking it) with the UVB added the psychedelic effects have definitely increased.

s far as cbd production i believe this to be more of a pure genetics thing unaffected by outside factors other than the health and overall vigor of the plant. but what ive been wondering, besides testing, if there is a visible feature, that allows you to "measure" your CDB content. in other words does the content of CDB effect the shape and size of trichomes. from what ive seen from my pet project, that i believe to be high in CBD( reason i believe this, lets keep it simple, smoke is not that great, tastes or high, its very sleepy and tired buzz. obviously i have no way of testing) trichomes that form on high cbd plants tend to have a smaller stalk, and smaller size heads in general. i have experienced this effect with many shit bag seed plants but alas no way of proving.

but anyways back to Uvb and CBD, no i dont think there is any correlation unfortunately.

polyarcturus said:

i forget where i read it but there is an article somewhere(im looking) that states the reactivity in the production of essential oils, on terms of both the energy of light and the percentage of oil production. UVa was something like 20% less effective. and 420nm-460nm was like 15% down to 5% as effective as UVb in terms of oil production for the amount of light it took and the energy needed to create the light.
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hope you can find that article. Makes sense that as you move away from UVB the effect would diminish.

polyarcturus said:

.... if there is a visible feature, that allows you to "measure" your CDB content. in other words does the content of CDB effect the shape and size of trichomes.

but anyways back to Uvb and CBD, no i dont think there is any correlation unfortunately.

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I will say that too much UVB late in flower will cause the trichomes to go amber prematurely. Just speculation here but I am pretty sure that amber trichomes have more degraded THC and therefore more CBD.
I always pack on the UVB early in flower and taper off as the plant matures. To demonstrate what I am referring to-- take a maturing bud ~1-2 weeks from harvest and put the UVB too close to it. It will go amber within several hours. powerful stuff.

yes it will cause some trich to amber early but this does not mean the bud is done.

THC degrades into CBN, not CBD. i just learned that myslef so dont feel too bad

i use UVB 12/12 entire time at full strength regulating the exposure and time is unnatural, UV rays re emitted all day by the sun and like i said just cause hairs are red and trich are amber, if that buds still fluff it aint done.