Mixed spectrum (HPS & MH) for flower.

Raven121415 said:

Indeed. I am just trying to replicate the quality I had from my floro grow while increasing the yield with the HID lighting.

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floro?
GH?
-- edit --
Oh I get it.

MichiganMedGrower said:

Yes. For years growers have been switching to metal halide the last two weeks for a thc boost.

And the few percent possible increase in thc still happens.

Solis tech made a 10k finishing bulb with more uv for his purpose.

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There was one particular accredited study from a university that showed a 20%-30% increase in thc. I forget which but an increase of 1/4 is a pretty major gain.

Raven121415 said:

I currently have a 1000w HPS, and have been considering adding a 600w MH to that on a light mover. Would 600w MH to 1000w HPS be a good mix? Looking to take advantage of the UVB in the MH as well. Anyone doing, or have done this with good results?

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UVB also had some negative effects on the plant and is a very small percentage of natural sunlight so it's not likely that the plants would benefit much from it compared to the side effects, at least in the amounts you'd get from the bulb.

A better option would be to go with a mh with a sealed hood. The glass will filter the UVB/UVC but leave most of the UVA intact so that you'll get the UV benefit with the negative side effects.

Edit: I did some further reading and it turns out that UVB may actually be responsible for the higher thc levels. The UVB is only about 1/20 of the UVA so getting the ratio right is important.

SchmoeJoe said:

There was one particular accredited study from a university that showed a 20%-30% increase in thc. I forget which but an increase of 1/4 is a pretty major gain.

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I have read the 30% but that is of total canabanoids not an increase of 30%.

That's the kind of word track we learned in sales training.

So if the pot had 17% thc a 25% increase is 4.2% or 21.2% total. which is exactly what added uvb can do from all the stuff I have read.

MichiganMedGrower said:

I have read the 30% but that is of total canabanoids not an increase of 30%.

That's the kind of word track we learned in sales training.

So if the pot had 17% thc a 25% increase is 4.2% or 21.2% total. which is exactly what added uvb can do from all the stuff I have read.

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Exactly. I thought I was clear enough. That's exactly what I was saying. It's an average of a 25% increase of content over the control plants. But the study I was referring to only measured thc and cbd specifically. It wasn't total cannabinoids.

The study used a drug strain and a hemp strain. The hemp strain was unaffected and only the thc was affected in the drug strain.