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UV lamp for sterilizers

Discussion in 'Lighting' started by artis sideley, Sep 29, 2008.

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  1. I intend to acquire an UV sterilizer for my aquarium water, I've found out that the market currently offers 2
    technologies: UV Led and mercury vapor discharge. Mercury vapor is well known, but does the UV emitter LEds fit the job
    and how long it could last ?
     
  2. Steve

    Steve Guest

    255 nm UV leds
    http://www.s-et.com
    http://shop.spectrecology.com/category.sc?categoryId=10&gclid=CL7m69K6wJUCFQopIgod3hBqRg
    http://www.roithner-laser.com/LED_UV_SEOUL.htm
    http://www.socled.com/en/product/prd/DeepUVLED.asp

    The 255 nm version costs $300. Perhaps the 254 nm line from mercury
    is used since that happens to be the wavelength where such a laimp has
    a strong emission. Maybe other UV wavelengths would also work for
    sterilization but those wavelengths haven't been used because a light
    source with strong intensity at other wavelengths is not readily
    available. Lifetime of the 255 nm UV led is only a few hundred hours
    and their intensity degrades with time.

    UV leds near 400 nm are available for a few dollars.
     
  3. I would go with mercury vapor. UVC and UVB LEDs put out a few
    milliwatts or less and cost big bucks.

    The most germicidal wavelengths are UVC, but a little longer than the
    mercury line - maybe around 265-270 nm or so. 253.7 nm is close enough.
    The most effective LEDs would be of longer UVC wavelengths. Keep in mind
    that longer UVC wavelengths are easier for UVC LEDs to produce than
    shorter UVC wavelengths.
    But whatever UV LED is best will not be as good as mercury vapor, unless
    it will be irradiating a very small area from a unit having a requirement
    of small size.

    - Don Klipstein ()
     
  4. half a milliwatt of 254 nm for $300:

    http://leddev.wordpress.com/2007/11/29/
    finally-germicidal-uv-leds-for-the-rest-of-us/

    1.5 mW at 280 nm:

    http://compoundsemiconductor.net/cws/article/news/26133

    255 nm LEDs have pricing ranging from about $10.50 each for a million to
    about $30 apiece for 50K pieces to about $270 each for 1-10 pieces.
    280 nm ones range from about $7 each for a million to about $170 each
    for 1-10 pieces.

    The datasheet mentions a 280 nm one producing half a milliwatt.

    http://www.s-et.com/?gclid=CKGo7vrShJYCFQQrFQodk21bEg

    - Don Klipstein ()
     
  5. Jeff Jonas

    Jeff Jonas Guest

    I intend to acquire an UV sterilizer for my aquarium water, I've found out
    Google finds some:

    http://ledmuseum.home.att.net/leduv.htm
    ULTRAVIOLET 250-395nm Gallium Nitride

    255 nm here:
    http://www.roithner-laser.com/LED_diverse.htm
    http://www.roithner-laser.com/LED_UV_SEOUL.htm

    and:
    http://www.photonsystems.com/sub/products/leds.php
    Deep ultraviolet from an LED
    230nm to 280nm
    Photon Systems in developing a new family of deep UV
    semiconductor light emitting devices.
    LED devices between 250nm and 280nm are available now
    and LEDs and lasers emitting between 230nm and 280nm are still in development.
    Specifications
    Model UV LED-280
    CW output power: >0.5 mW
    Center wavelength 280 ± 10 nm
    Spectral linewidth <20nm FWHM
    CW Drive current, forward: <25 mA, max.
    Reverse current <100uA max.
    Operating voltage, reverse: 6 VDC
    Forward voltage 7.5V max.
    Max.pulsed drive current: 200 mA at 1% duty cycle
    Package TO-39 hermetic package with UV window
    8.3mm dia by 4.5mm high

    Model UV LED-255
    CW output power: >0.1 mW
    Center wavelength 255 ± 10 nm
    Spectral linewidth <20nm FWHM
    CW Drive current, forward: <25 mA, max.
    Reverse current <100uA max.
    Operating voltage, reverse: 6 VDC
    Forward voltage 7.5V max.
    Max.pulsed drive current: 200 mA at 1% duty cycle
    Package TO-39 hermetic package with UV window
    8.3mm dia by 4.5mm high
     
  6. <Examples, in short>

    Notice the output powers - milliwatt and fractional milliwatt range.
    Low pressure mercury germicidal lamps mostly produce watts of 253.7 nm UV.

    - Don Klipstein ()
     
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