Recent content by Vivek

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

    Re: Nichia 365nm Light offerings Don, Uranium glass beads. They are pale green to very pale yellow under normal light and just glow under UV (even in daylight!). Uranium doped glass ("press glass", "Uran glas" in German http://de.wikipedia.org/wiki/Uranglas) is an excellent UV indicator...
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    Nichia 365nm UV Light offerings (NEW 5-12-17)

    Re: Nichia 365nm Light offerings Here is a fluorescence shot with Don's Nichia LE.
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    Nichia 365nm UV Aleph Light Engines

    Thanks. I have one of Don's original offerings. I have also corresponded with Will and Don over these (Will recommended Don's offerings to me). My request (if out of place/time, my apologies) was for the bare i-LEDs if there is a group buy. BTW, hearty thanks to Will for his helpful and kind...
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    Nichia 365nm UV Aleph Light Engines

    If there is a group buy, I would like to put my name for 3 pieces.
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    Nichia 365nm UV Light offerings (NEW 5-12-17)

    Re: Nichia 365nm Light offerings I second that (STRONGLY). If you see the dark room looking hazy (under UV) then that is your eyes fluorescing!! (BTW, i keep seeing that I have one PM here. When I click on the Private Messages, it takes me nowhere)
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    Nichia 365nm UV Light offerings (NEW 5-12-17)

    Re: Nichia 365nm Light offerings Yes, indeed. There are valid scientific explanations for your observations which is well beyond the scope of this thread or this forum. Your conclusions are correct. FWIW, what I said in my earlier post is that *in principle* one could choose a (say) a...
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    Nichia 365nm UV Light offerings (NEW 5-12-17)

    Re: Nichia 365nm Light offerings It is easier to get longer wavelength light than the higher energy, shorter wavelength light (that too with such narrow spectral window). If longer wavelength light output is desired from the 365nm Nichia i-LED, a suitable fluorescent cover (diffuser) could...
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    Nichia 365nm UV Light offerings (NEW 5-12-17)

    Re: Nichia 365nm Light offerings Got it today in the Hague. Simple padded envelope is fast and reliable.
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    Nichia 365nm UV Light offerings (NEW 5-12-17)

    Re: Nichia 365nm Light offerings Don, A quick note to acknowledge that your shipment arrived safe and sound.:twothumbs Thanks a bunch!:)
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    Nichia 365nm UV Light offerings (NEW 5-12-17)

    Re: Nichia 365nm Light offerings I have been using one (NCSU033a) ever since it was on sale and I do have experience with various UV sources (research as well as photography which is my current interest) to provide the cautionary note. The difference between midday Sun and the Nichia is this...
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    Nichia 365nm UV Light offerings (NEW 5-12-17)

    Re: Nichia 365nm Light offerings The first para gives the answer to the second. The Nichia 365nm LED is a true UV LED giving clean (near) monochromatic UV. The other so called UV LEDs are UV only for name sake. Lint, which is everywhere, for example, will be visible (bright blue...
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    Nichia 365nm UV Light offerings (NEW 5-12-17)

    Re: Nichia 365nm Light offerings Don, Posted here: http://nikongear.com/smf/index.php?board=27.0 and here: http://forum.getdpi.com/forum/showthread.php?t=11400 You are doing a fantastic service by offering these. I would like to record my personal thanks to you!
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    Nichia 365nm UV Light offerings (NEW 5-12-17)

    Re: Nichia 365nm Light offerings Don, If you wish, I can post a link to this thread in some photo fora.
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    Nichia 365nm UV Light offerings (NEW 5-12-17)

    Re: Nichia 365nm Light offerings UV Photography. (Some of my UV captures: http://www.flickr.com/photos/vivek-iyer/sets/72157600151220643/ almost all are reflected UV) I have been in touch with Will and Don. My interest in these are for photography- not just fluorescence but for reflected...
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