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Thread: Deep UV (254nm) LEDs

  1. #1

    Default Deep UV (254nm) LEDs

    My first post here.

    I have been looking to buy a deep UV LED but all I found were really expensive ($270/led) emitters from Seoul

    http://www.biouvled.com/_homepage/home_kor/asp/main.asp

    Are there any cheaper sources for 254nm leds?

    Cheers

    Thomas

  2. #2
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    Default Re: Deep UV (254nm) LEDs

    Bump - for an interesting question. Most of the ones used here in mods etc seem to be longer wavelength, ~400 nm. The ones you mention above seem to be very specialised ones for scientific / medical etc purposes, and probably have to be very precise, hence the high cost.

    What do you want to use these for?

    And welcome to CPF!
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    Default Re: Deep UV (254nm) LEDs

    http://www.roithner-laser.at/


    Seem to have quite a few at reasonable prices.
    Get thee behind me Satan..................and push

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    Default Re: Deep UV (254nm) LEDs

    Several months ago, I spoke to Curt at Peak LED Solutions looking for something similar. He said that they have and could again, make a UV light with a shorter wavelength. However, at that time, he said the UV led's were even more expensive (I passed and am waiting for better prices).
    Brian

    After getting an HDS, other flashlights seem much less relevant (Except for some of the really special lights found on CPF!)
    When things are really dark, a dim light for a long time is much better than a blinding light for a short time.

  5. #5
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    Default Re: Deep UV (254nm) LEDs

    Hi Thomas,
    you have just missed a groupbuy for those LED's here: http://www.candlepowerforums.com/vb/...d.php?t=164603

    Maybe you can try to ask per PM if there are any more leftovers.
    Pineapple,Mag3DMod,Mag2DMod,Mag1DMod,Luxeon-MM,3AAMM,HotwireMM,solitairmod,FenixP1,LOP,LOD,P1D CE,LiteFluxLF1/2/5,HDSU60GTbyMilkyspit,HDSU60Seould,HDSB42SeouldExo lionSS,Rexlight2.0,X1,X0modded,glo-toobFXold/new,Q3,Zebralight,Hyperion,JB/CLE's,MKIIR,ProIIIST,RATwisty

  6. #6

    Default Re: Deep UV (254nm) LEDs

    https://designingin.com/ 350 and 360 nm FoxGroup LEDs. 350's cost way more than 360's. You have to register (free) to get prices.

  7. #7

    Default Re: Deep UV (254nm) LEDs

    Thanks for the replies. It looks like no one has a cheaper source for these 254nm LED.'s.

    I wanted to build a small flashlight to look at flourescence in minerals and the longer wavelength UV leds do not work for these minerals.

    For the time being I will probably go with a standard portable UV light which can be had for about $50.

    Cheers

    Thomas

  8. #8
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    Default Re: Deep UV (254nm) LEDs

    Quote Originally Posted by thomaspf View Post
    Thanks for the replies. It looks like no one has a cheaper source for these 254nm LED.'s.

    I wanted to build a small flashlight to look at flourescence in minerals and the longer wavelength UV leds do not work for these minerals.

    For the time being I will probably go with a standard portable UV light which can be had for about $50.

    Cheers

    Thomas
    Just curious, what minerals won't fluoresce under a 365nm UV light?

    -LT
    lunal tic (n)
    a distinctive behavioral trait or quirk directly related to or caused by light [15th cent. Latin lunaris. Ultimately from an IE word meaning “light,”] and [Early 19th cent. Italian ticchio.] see also: moon quirk

  9. #9
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    Default Re: Deep UV (254nm) LEDs

    The most spectacular ones - including Franklinite and Willemite.

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    Default Re: Deep UV (254nm) LEDs

    What is the nm of the plain old black lights.

    Bill

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    Default Re: Deep UV (254nm) LEDs

    Quote Originally Posted by Bullzeyebill View Post
    What is the nm of the plain old black lights.

    Bill
    Those are 365nm. The Fox Group LEDs come in at 360nm, actually a tad shorter than traditional fluorescent black lights, but as LED wavelengths get shorter, their output gets weaker.

  12. #12
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    Default Re: Deep UV (254nm) LEDs

    I thought that glass or plastic stopped the really short UV. How could you make an LED that actually got the UV past the "plastic" package or lens?

    -LT
    lunal tic (n)
    a distinctive behavioral trait or quirk directly related to or caused by light [15th cent. Latin lunaris. Ultimately from an IE word meaning “light,”] and [Early 19th cent. Italian ticchio.] see also: moon quirk

  13. #13

    Default Re: Deep UV (254nm) LEDs

    On a recent geology trip my son collected some interesting minerals. I forgot the names but I do recall that some of them contain Strontium which was bright green under these 254nm lamps and they glowed on after turning off the light. We also collected some bright orange and blue stuff.

    I have a 360nm UV led and these minerals just don't do anything with that light.

    Thanks

    Thomas

  14. #14
    Flashaholic* Lunal_Tic's Avatar
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    Default Re: Deep UV (254nm) LEDs

    Isn't Strontium what they put in glow powder and the hands of watches?

    -LT
    lunal tic (n)
    a distinctive behavioral trait or quirk directly related to or caused by light [15th cent. Latin lunaris. Ultimately from an IE word meaning “light,”] and [Early 19th cent. Italian ticchio.] see also: moon quirk

  15. #15
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    Default Re: Deep UV (254nm) LEDs

    Tritium is used in some watches. I suppose the sun would give off the proper wavelength UV, but of course, it would be drowned out in the day. It would have to be absorbed then, and still be seen later on.

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    Default Re: Deep UV (254nm) LEDs

    Quote Originally Posted by Lunal_Tic View Post
    I thought that glass or plastic stopped the really short UV. How could you make an LED that actually got the UV past the "plastic" package or lens?

    -LT
    They use quartz instead of regular glass. That's the main reason why shortwave fluorescent lamps cost more than LW bulbs.

  17. #17
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    Default Re: Deep UV (254nm) LEDs

    A quartz encased LED, that sounds cool. I wonder if a quartz lens would be better than the sapphire that I've got on a 365nm now. I know it blocks a bit of output. I had a hard time finding a high output 365nm, 254nm is going to be tough methinks.

    -LT
    lunal tic (n)
    a distinctive behavioral trait or quirk directly related to or caused by light [15th cent. Latin lunaris. Ultimately from an IE word meaning “light,”] and [Early 19th cent. Italian ticchio.] see also: moon quirk

  18. #18

    Default Re: Deep UV (254nm) LEDs

    The only 254nm LEDs that I know of are the SET ones and as it has been said before they are are too expensive for commercial use. This is because going lower in wavelength is a mix of art and science, there are many factors to consider for manufacturers and it takes more time to develop UV led technology than visible LED technology. Prices do get sort of ridiculous when you go in the UV-B and UV-C range but this is because the technology is just prevailing. I remember the first computer that i bought cost me about 5000$ and well compared to now, in terms of price and performance i would not pay a penny to have one. Expect the same in UV LED technology, its only a matter of time til we have a low wavelength UV LED source that wont cost an arm and a leg.
    Cheers

  19. #19

    Default Re: Deep UV (254nm) LEDs

    As for fox Group LEDs theyr typical output is 361 - 362 nm at 20mA, you can get the specific 365nm peak at a higher forward current(wont damage if you want to pulse the LED), or even after keeping the leds on for a couple of minutes( heat shifts the spectrum a little )

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