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Thread: Nichia 365nm UV Light offerings (NEW 5-12-17)

  1. #181
    *Flashaholic* McGizmo's Avatar
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    Default Re: Nichia 365nm Light offerings

    Cataract,
    I don't have any measuring equipment that would take your requested measure of the UV source.
    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  2. #182
    Flashaholic* Cataract's Avatar
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    Default Re: Nichia 365nm Light offerings

    Quote Originally Posted by McGizmo View Post
    Cataract,
    I don't have any measuring equipment that would take your requested measure of the UV source.
    Ok, let's just hope someone else might. Meanwhile I'll see if I can convince my boss we're the best resource to make those measurements and need to order one

    Are there any 18650 bodies available for those?
    Cataract, Shiny things specialist.
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  3. #183
    Flashaholic* BenChiew's Avatar
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    Default

    Don.
    Are you using the same emitter you did in the earlier part of this thread?
    Has there been any updated emitters today?

  4. #184
    *Flashaholic* McGizmo's Avatar
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    Default Re: Nichia 365nm Light offerings

    Still working with the 033B.
    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  5. #185
    Flashaholic* BenChiew's Avatar
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    Default Re: Nichia 365nm Light offerings



    Quote Originally Posted by McGizmo View Post
    Still working with the 033B.

  6. #186
    Flashaholic* BenChiew's Avatar
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    Default Re: Nichia 365nm Light offerings

    Don. Earlier you mentioned in the Haiku UV setup, you had the centering ring removed to accommodate the UV emitter. What other emitter LE combination can I use with this Haiku?

  7. #187
    *Flashaholic* McGizmo's Avatar
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    Default Re: Nichia 365nm Light offerings

    Quote Originally Posted by Benchiew View Post
    Don. Earlier you mentioned in the Haiku UV setup, you had the centering ring removed to accommodate the UV emitter. What other emitter LE combination can I use with this Haiku?
    Nothing else I am aware of or at least working with.
    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  8. #188
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    Default Re: Nichia 365nm Light offerings

    Hi Don.

    Do you offer the head only on the UV Sapphire?

  9. #189
    Flashaholic* BenChiew's Avatar
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    Default Nichia 365nm Light offerings

    I don't believe Don does. He orders the head and body in pairs. Selling you the head will leave him a headless body.

  10. #190
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    Default Re: Nichia 365nm Light offerings

    Thanks for the info mate.

  11. #191
    Flashaholic* BenChiew's Avatar
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    Default Nichia 365nm Light offerings

    Kitman22. Since you are already prepared to buy the LE and head, you will not save a substantial amount by leaving the body out. It is probably better for you to just buy the whole sapphire. At least you would not get the head mixed up. Just my 2 cents.

  12. #192
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    Default Re: Nichia 365nm Light offerings

    Hello Mr.Don,

    UV LE $200 ×1
    Sapphire version which uses a Nichia 5 mm 365 nm UV LED ×1

    I want to order LE and sapphire UV.

    Is there the stock?

    Thank you
    E-J-J
    Last edited by E-J-J; 12-03-2012 at 10:25 AM.

  13. #193
    *Flashaholic* McGizmo's Avatar
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    Default Re: Nichia 365nm Light offerings

    Hello E-J-J,
    Yes, I can build bott the Sapphire UV as well as a UV LE for you.
    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  14. #194

    Default Re: Nichia 365nm Light offerings

    If you want to see what underwater fluorescence looks like (which is what I was using the Nichia UV LEDs for),
    and why some people say that it is like being in the movie "Avatar",
    have a look at this video of mine:
    http://www.youtube.com/watch?v=4V9TCdCbX6U
    This video was made with blue light (around 450 nm) instead of UV, however,
    because, as I found out by trying, the fluorescence is much stronger with blue light,
    apparently because marine life has adapted during evolution to the properties of water,
    which is more transparent to blue light than it is to UV.
    Enjoy!

  15. #195
    Flashaholic* TweakMDS's Avatar
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    Default Re: Nichia 365nm Light offerings

    That's fantastic, looks really good.

    I'm currently waiting for an AMC mule that's going to host a Nichia 365nm but datiLED is building it. That blue led already shows amazing fluorescence though, very impressive.

  16. #196

    Default Nichia 365nm Light offerings

    Wow. That must have been really amazing in person.

  17. #197
    *Flashaholic* McGizmo's Avatar
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    Default Re: Nichia 365nm Light offerings

    Very cool LarsB! Were those pipe fish in the video? If the fluorescing of the corals is a strategy that has evolved and not a secondary byproduct, it is not surprising that blue light would be more effective. When I first heard of using UV underwater I was somewhat surprised as I was under the impression that its transmission was quite limited, relatively speaking.

    Last year I did a night dive with some friends from Scripps who wanted to see if UV light would be effective in showing some fluorescein dye that had been added to a water treatment plant. The plant finishes up treatment of the water and then pumps it down 200 feet into the ground, not far from the ocean. There are seeps near by where water comes up through the reef and this dye can be seen during daylight. The UV light (365nm) was quite effective in showing its presence at night. 395 nm was not as effective and 450 nm blue was least effective. The three sources had different results in fluorescing the corals. The royal blue seemed to have the best all around results and we were not using any filters for viewing the light. If I recall correctly, the boundary layers of competition between corals and areas of stress for the corals were most evident under the 365 nm.
    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  18. #198

    Default Re: Nichia 365nm Light offerings

    Hi Don!

    Quote Originally Posted by McGizmo View Post
    Very cool LarsB! Were those pipe fish in the video?
    Thanks!
    Yes, those were pipe fish!

    Quote Originally Posted by McGizmo View Post
    If the fluorescing of the corals is a strategy that has evolved and not a secondary byproduct, it is not surprising that blue light would be more effective.
    Indeed!
    I'm surprised by the depth of your knowledge in this matter!
    Do you have a degree in biology, by any chance?

    Quote Originally Posted by McGizmo View Post
    When I first heard of using UV underwater I was somewhat surprised as I was under the impression that its transmission was quite limited, relatively speaking.
    That's true, but it's okay.
    See here for an example:


    (This is a torch with 2 x Nichia NCSU033B)

    Due to the fluorescence of the water itself and that of organic silt dispersed in the water (see also The inherent visible light signature of an intense underwater ultraviolet light source due to combined Raman and fluorescence effects), the beam is strongly visible (although it shouldn't be, because UV is invisible) and hence doesn't reach very far (too much UV converted into visible light too quickly).
    But it's still useable, as can be seen in the following video: http://www.youtube.com/watch?v=Yw4YdIjbfFU
    (Made with a torch comprising 4 x Nichia NC4U133A)

    Quote Originally Posted by McGizmo View Post
    Last year I did a night dive with some friends from Scripps who wanted to see if UV light would be effective in showing some fluorescein dye that had been added to a water treatment plant. The plant finishes up treatment of the water and then pumps it down 200 feet into the ground, not far from the ocean. There are seeps near by where water comes up through the reef and this dye can be seen during daylight. The UV light (365nm) was quite effective in showing its presence at night. 395 nm was not as effective and 450 nm blue was least effective. The three sources had different results in fluorescing the corals. The royal blue seemed to have the best all around results and we were not using any filters for viewing the light. If I recall correctly, the boundary layers of competition between corals and areas of stress for the corals were most evident under the 365 nm.
    I wonder whether you know Melissa S. Roth and Dimitri D. Deheyn from Scripps?!
    They do research in coral health assessment using fluorescence (see also http://www.youtube.com/watch?v=yGQ9tw1yeZk).

    It is very interesting to hear that UV may be more useful to detect boundary layers of competition between corals and areas of stress for the corals!

    I have to pass this information on to Prof. Grunz (another member of CPF, BTW; username horstartur) who is currently in Dahab/Egypt testing new fluorescence torches at the RSEC (Red Sea Environmental Centre).
    The RSEC does research in this area, too.
    Thanks a lot!
    Last edited by LarsB; 01-18-2013 at 09:38 AM.

  19. #199
    *Flashaholic* McGizmo's Avatar
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    Default Re: Nichia 365nm Light offerings

    Hi LarsB,
    I have only met a few of the Scripps PhD students and advisers who are studying some of the reef activity over here. The primary focus for them is the competition between algae and coral for reef real estate and contributions of various herbivores in keeping the algae in check. I can count the number of times I have been out on the reef at dark with UV light sources on one hand and still pick my nose.

    I have never taken a biology class and my incredibly poor memory for names would make doing so a waste of time.

    I have picked up some knowledge from discussions and personal observations and I am curious as to how and why life forms proceed as they do. That coral is partly animal, plant and mineral is pretty fascinating. Can I assume that the fluorescing takes place in the alga within the coral and a bleached coral would not flouresce the same as it would while hosting the alga?

    I find it interesting to consider that when viewing some of the life underwater like coral and say squid or jelly fish, you can't be certain that what you see is based on reflected light or emissive light. That statement assumes or includes fluorescence as emissive in nature which may be incorrect.

    I would imagine that one way to determine fluorescent light VS reflected light from coral would be by illuminating it with either narrow bands or a fuller spectrum of light that is absent the UV and near UV or even blue bands. For example, if a yellow coral under ambient light changes color or relative intensity drastically when illuminated by a spectral source including its apparent color but no light from the spectrum typically associated with fluorescing.

    On a related note, I recall discussions years back here on the forum relating to the most efficient light source for UW illumination. Although monochromatic, it would seem that in "clear" water, an optimal blue LED source might be best at illuminating and contrasting objects at distance. A white target viewed at distance probably tells you the most efficient spectrum in terms of penetration by virtue of what color it appears to be in reflection.
    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  20. #200
    *Flashaholic* McGizmo's Avatar
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    Default Re: Nichia 365nm Light offerings

    LarsB,
    I checked with my Scripps friends and they are friends of the two you mentioned. Apparently Melissa is now doing post doctorate at Berkeley. They also mentioned that the Jaffe Laboratory might be of interest. You are probably aware of these folks and their "stuff".
    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  21. #201

    Default Re: Nichia 365nm Light offerings

    Hi Don!

    Quote Originally Posted by McGizmo View Post
    Hi LarsB,
    I have only met a few of the Scripps PhD students and advisers who are studying some of the reef activity over here. The primary focus for them is the competition between algae and coral for reef real estate and contributions of various herbivores in keeping the algae in check. I can count the number of times I have been out on the reef at dark with UV light sources on one hand and still pick my nose.
    And doesn't it make you long for more? :-)

    Quote Originally Posted by McGizmo View Post
    I have never taken a biology class and my incredibly poor memory for names would make doing so a waste of time.
    I don't believe a word about your poor memory! :-)

    Quote Originally Posted by McGizmo View Post
    I have picked up some knowledge from discussions and personal observations
    So much for your bad memory! :-)

    Quote Originally Posted by McGizmo View Post
    and I am curious as to how and why life forms proceed as they do. That coral is partly animal, plant and mineral is pretty fascinating. Can I assume that the fluorescing takes place in the alga within the coral and a bleached coral would not flouresce the same as it would while hosting the alga?
    As far as I know (but I'm not an expert), both the symbiotic algae and the corals themselves contain fluorescing proteins.
    It is still a mystery however what the purpose of these is, besides maybe acting as a sunscreen against damaging radiation and providing the symbiotic algae with light they can use for photosynthesis, allowing the corals to dwell deeper and thus giving them an advantage over corals who can't do this.
    But research is really just beginning.
    An interesting recent find was that apparently the fluorescent proteins can act as electron donors, just as Chlorophyll (the green substance in plants responsible for photosynthesis) does (electron donation is a necessary first step in photosynthesis).
    This might shatter the conventional wisdom/definition that plants are the organisms that are capable of photosynthesis and animals are the organisms which are incapable of photosynthesis.

    Quote Originally Posted by McGizmo View Post
    I find it interesting to consider that when viewing some of the life underwater like coral and say squid or jelly fish, you can't be certain that what you see is based on reflected light or emissive light. That statement assumes or includes fluorescence as emissive in nature which may be incorrect.
    That simply depends on how you define it, but there clearly *is* a difference between reflected and fluorescent light.
    And indeed, sometimes you don't even realize that what you see is actually fluorescence, such as in the following picture:



    This image shows an anemone displaying red fluorescence, at a depth (about 18m or 60ft) at which red ambient light is normally absent, due to its absorption through water on its way down.

    Quote Originally Posted by McGizmo View Post
    I would imagine that one way to determine fluorescent light VS reflected light from coral would be by illuminating it with either narrow bands or a fuller spectrum of light that is absent the UV and near UV or even blue bands. For example, if a yellow coral under ambient light changes color or relative intensity drastically when illuminated by a spectral source including its apparent color but no light from the spectrum typically associated with fluorescing.

    On a related note, I recall discussions years back here on the forum relating to the most efficient light source for UW illumination. Although monochromatic, it would seem that in "clear" water, an optimal blue LED source might be best at illuminating and contrasting objects at distance. A white target viewed at distance probably tells you the most efficient spectrum in terms of penetration by virtue of what color it appears to be in reflection.
    You lost me a bit here, unfortunately I didn't fully understand what you meant.

    Cheers,
    LarsB

  22. #202

    Default Re: Nichia 365nm Light offerings

    Quote Originally Posted by McGizmo View Post
    LarsB,
    I checked with my Scripps friends and they are friends of the two you mentioned.
    Hi Don, thanks for letting me know! :-)

    Quote Originally Posted by McGizmo View Post
    Apparently Melissa is now doing post doctorate at Berkeley. They also mentioned that the Jaffe Laboratory might be of interest. You are probably aware of these folks and their "stuff".
    Actually I'm not, our contact has been very brief, and I've only found some of their works accidentally by googling around for pages related to underwater fluorescence. :-)

  23. #203
    *Flashaholic* McGizmo's Avatar
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    Default Re: Nichia 365nm Light offerings

    Hi LarsB,
    Let me try again.

    If an object appears to the viewer to be red under a full spectrum of light it is red because:
    1)It reflects the red portion of the spectrum
    2)absorbs the full spectrum but emanates red light either by fluorescing or actually generating red light
    If you place the object in the dark and you still see red then it is generating this light.
    If you place the object in the dark and flood it with a light source missing red and yet still see the object as red then I would venture that it is fluorescing.

    If that makes sense, cool and if it doesn't no worries.

    My last comment could be otherwise stated in recognition that water filters out light but non uniformly. If one were to determine what band of light has the greatest transmission through water and selected a LED matching this band you would have a monochromatic source with the greatest efficiency in terms of penetration. Admittedly, this monochromatic source of illumination is only as good as the objects being illuminated are apt to reflect it. I would imagine inorganic materials as well as sea life that spends time near the surface would be more apt to show up than deep dwelling critters.

    I find it fascinating to ponder the why of light absorption or reflection and how this might have come about for a reason that enhances the survival of a species.

    When one chooses a flashlight for illumination, the proper choice is based on what objects of interest reflect and not on so much on what comes out the front of the flashlight. That is to say it's what comes back to us that matters. A UV light with little visible light is a good example of this. A red light source at any depth is also a good example. At least that's my take.
    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  24. #204

    Default Re: Nichia 365nm Light offerings

    Hi Don!

    Quote Originally Posted by McGizmo View Post
    Hi LarsB,
    Let me try again.

    If an object appears to the viewer to be red under a full spectrum of light it is red because:
    1)It reflects the red portion of the spectrum
    2)absorbs the full spectrum but emanates red light either by fluorescing or actually generating red light
    If you place the object in the dark and you still see red then it is generating this light.
    If you place the object in the dark and flood it with a light source missing red and yet still see the object as red then I would venture that it is fluorescing.
    The latter is exactly what happens in the image above with the red anemone; the ambient light is a full spectrum source of light missing red at that depth under water.

    Quote Originally Posted by McGizmo View Post
    If that makes sense, cool and if it doesn't no worries.
    It's all clear now! :-)

    Quote Originally Posted by McGizmo View Post
    My last comment could be otherwise stated in recognition that water filters out light but non uniformly. If one were to determine what band of light has the greatest transmission through water and selected a LED matching this band you would have a monochromatic source with the greatest efficiency in terms of penetration.
    This is exactly what we do with our blue lights. Water is most transparent to blue light. Blue light penetrates the sea the deepest, where all other colours have been filtered out by the water column above.
    Which is probably why underwater organisms fluoresce best with blue light, because they adapted to this property of water during evolution, allowing some corals to even dwell in the deep sea.

    Quote Originally Posted by McGizmo View Post
    Admittedly, this monochromatic source of illumination is only as good as the objects being illuminated are apt to reflect it. I would imagine inorganic materials as well as sea life that spends time near the surface would be more apt to show up than deep dwelling critters.
    Well, you can see exactly that in our fluorescence pictures, because our yellow mask and camera filters actually let pass a tiny little bit of blue light:
    https://picasaweb.google.com/1045330...bSeptember2012



    Quote Originally Posted by McGizmo View Post
    I find it fascinating to ponder the why of light absorption or reflection and how this might have come about for a reason that enhances the survival of a species.
    Indeed, this is the great mystery at the moment.

    Quote Originally Posted by McGizmo View Post
    When one chooses a flashlight for illumination, the proper choice is based on what objects of interest reflect and not on so much on what comes out the front of the flashlight. That is to say it's what comes back to us that matters. A UV light with little visible light is a good example of this. A red light source at any depth is also a good example. At least that's my take.
    Of course what comes back matters (as opposed to what comes out of the front of a flashlight), because that's precisely how we see things, by the light which bounces off of them.

  25. #205

    Default Re: Nichia 365nm Light offerings

    Was wondering if these were still available? Really looking for a flashlight that has a powerful UV light for making items fluoresce when I need it.

  26. #206
    *Flashaholic* McGizmo's Avatar
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    Default Re: Nichia 365nm Light offerings

    Yes, these are still available.
    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  27. #207

    Default Re: Nichia 365nm Light offerings

    Quote Originally Posted by McGizmo View Post
    Yes, these are still available.
    What would the cost be for a complete, ready to use product? Which one do you recommend?

  28. #208
    *Flashaholic* gunga's Avatar
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    Default Nichia 365nm Light offerings

    How much modification of the reflector is needed to put this uv light engine into an aleph a19 head?

  29. #209
    *Flashaholic* McGizmo's Avatar
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    Default Re: Nichia 365nm Light offerings

    Quote Originally Posted by gunga View Post
    How much modification of the reflector is needed to put this uv light engine into an aleph a19 head?
    You will need to remove some material off the front end of the reflector so the LE can digest further into the head.
    Build Prices .... some mods and builds (not 4 sale) "Nature can be cruel- but we don't have to be."~ Temple Grandin

  30. #210
    *Flashaholic* gunga's Avatar
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    Default Nichia 365nm Light offerings

    Any idea how much? A little scary sanding the front if the reflector.

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