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  1. DennisBrown

    Should I add UVB Light?

    One of the things a lot of manufacturers don't like to admit is what they don't know. Way back 20 years ago, we made the decision to use only UVA to "water down" our UVB lamps, ie: to make them less than a dangerous 100% UVB lamp. My gut told me that UVA plays a roll, and we are slowly...
  2. DennisBrown

    Should I add UVB Light?

    We have 4 foot F32T8 UVA bulbs, centered on 366nm, no UVB just the single phosphor, if you ever got curious. Runs the same fixture as Flower Power. I'm overstocked on them, as they were designed for wood finishing and got superseded by the SG series (the parent of the Flower Power), which is...
  3. DennisBrown

    Should I add UVB Light?

    The sorghum tests aren't from the 80s, they are ongoing. But I'm not going to get into a pissing contest. You are free to believe as you choose.
  4. DennisBrown

    Should I add UVB Light?

    According to Ed Rosenthal (who doesn't sell UVB as far as I know), UVB and cannabis has some science going back 100 years. I think there are some books on it that I know from the 1980s. Ed tested with some prototypes of ours years ago. We did about a decade of testing and prototyping before...
  5. DennisBrown

    Should I add UVB Light?

    UVC is less effective because UVR8 is most sensitive to high band UVB, so UVC will trigger it, but it takes more, and that is the problem. UVC is very tricky to use. No plants have mechanisms to defend themselves against UVC since it doesn't reach the earth normally. Fortunately, UVC doesn't...
  6. DennisBrown

    Should I add UVB Light?

    UVR8 sends chemical messages to the mother plant, so the whole plant is "aware", but does it react? I think it does some and have reason to think so, but I can't prove it. One other thing to remember about UVB is that it is a much smaller wavelength, so the penetration power is zero. In fact...
  7. DennisBrown

    Should I add UVB Light?

    As to when to run UVB, I'm not sure it matters. I've had several people test different times of the day, and the results were the same. Walter P. Haze, one of my testers, screwed up once and ran them from 12:00 to 2:00, but AM instead of PM. He didn't notice until he went to harvest. The...
  8. DennisBrown

    Should I add UVB Light?

    I don't have hard data (which is hard to do for this) but anecdotally speaking, the whole plants SEEMS to benefit some if most of the plant is getting UV, so the lower and mids get some bump, but not nearly as much as the buds that are getting direct UV. It's one of those things we get...
  9. DennisBrown

    Should I add UVB Light?

    Our feedback on CBD came mainly from Ed Rosenthal, who said they found no increase, but that was with a prototype bulb that was lower in UVB, running 12 hours, similar to our SG-1 lamps. Looking at a few lab results of typical 1-2% CBD plants, compared to clones without UV, we saw CBD pretty...
  10. DennisBrown

    Should I add UVB Light?

    Honestly, I couldn't tell you much anything about it. I haven't bought one to test, and don't know a lot of people using those.
  11. DennisBrown

    Should I add UVB Light?

    I'm not avoiding at all. In fact, I've posted a couple of times about it, clearly saying I need more information. We've been selling lamps for many, many years. Burning plants is not common unless someone is running them too long. If there is another scenario that burns them, I'm the first...
  12. DennisBrown

    Should I add UVB Light?

    We just have a very different spectrum. I think they have more total UVB, but ours is shifted where we want it, in the absolute highest bands. This is also the part of the spectrum that has the most energy, and burn potential, but burning plants when used right is rare. If it is happening, I...
  13. DennisBrown

    Should I add UVB Light?

    "These UV tubes" aren't all the same. The vary as much as 10x the amount of UVB they have. There's someone in this thread using our Flower Power that is having an issue, but that is super rare, and again, we've been doing this longer than anyone. I've heard more from Agro users because their...
  14. DennisBrown

    Should I add UVB Light?

    That is true for visible light, but almost all surfaces do not reflect UV very well, if at all. In fact, filtering it out is trivial. We have to use special reflective materials, special clear plastics to transmit (OP-4 acrylic), etc. This is why we put reflective "paint" inside all of our...
  15. DennisBrown

    Should I add UVB Light?

    Not the best advice. The purpose of the distance isn't about power, it is about coverage. The farther you are, the larger the area you cover (but the lower the intensity via the Inverse Square Law). You generally reduce intensity only by adjusting the time. When you move the light closer...
  16. DennisBrown

    Should I add UVB Light?

    You would think that the UV would cause an increase in CBG, which is the precursor to THCa. That is the path for the plant to make THCa, which is the goal if she is trying to put on some sunscreen. My understanding is that it is an oxidase process, swapping hydrogen and oxygen around...
  17. DennisBrown

    Should I add UVB Light?

    Definitely call me though. You can also email me at [email protected] if you have any photos you want to share before the call, but now that I get the problem, I'm very curious and want to see this through. One of us will certainly learn something, and maybe both of us. I'm not familiar...
  18. DennisBrown

    Should I add UVB Light?

    It's hard to say why without having a lot more information. I've never them kill plants at 21" at 2 hours, ever, and 21" is certainly within spec. I think you said White Widow, which is one of the strains we have tested more than anything else locally since it is what I prefer for myself...
  19. DennisBrown

    Should I add UVB Light?

    Not sure where we are going with this. If people follow our directions exactly, they are happy with the results. Never had anyone ask for their money back because of THC, only one for PM and they refused to follow directions because they felt they understood UVB better than us. When we talk...
  20. DennisBrown

    Should I add UVB Light?

    We both would like to see more peer review studies. We give away a lot of gear to do small studies. And someone earlier was saying he does sell products, I don't know. And yes, he studies nutrients and the whole agriculture aspect, we don't. We specialize in pure UV research. We do with...
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