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Thread: Black Light

  1. #1
    Senior Member Bonaqua's Avatar
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    Black Light

    Is there any use for a black light in this hobby???

  2. #2
    Senior Member catatonik's Avatar
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    Not really... the BL dosent penetrate deep into the water. Anything under about 5' of water, in nature wouldn't see infrared or black light. You can try using one, wouldnt hurt. You might get some flourescense out of your fish and coral, but not alot more than the actinic.

  3. #3
    Senior Member Bonaqua's Avatar
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    Black light is borderline Ultra Violet light.
    UV is used to kill bacteria. That's my primary concern.
    I do not waant it to kill the good bacteria if any.
    I guess it depends on the bulb power.

  4. #4
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    I tried a black lite over my tank just to see and Catatonik was saying the light does not penetrate the water and only reflect on the white particule in the water if any present at that time

  5. #5
    Senior Member badmedicine's Avatar
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    It sure would bring the white colours of fish out more. I have a Koran Angel that would look pretty vibrant under black light.
    I have a lot of Patients

  6. #6
    Senior Member catatonik's Avatar
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    ultra violet like black light, does not penetrate well either... its just a matter of, that light spectrum not being present in nature, after only a few feet of water. Dony worry about your corals, black light dosent have the strength to kill anything. UV is a much higher wave-length.

  7. #7
    Moderator cres's Avatar
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    If you had a 400 Watt MH UV or Black Light, you might talk about too much UV getting to the coral.

    A 6-20 Watt Black Light isn't a concern.
    Sarchasm: The gulf between the author of sarcastic wit and the person who doesn't get it.

  8. #8
    Senior Member Deafboy's Avatar
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    I'm with Cres.


    BTW, UV is a very wide spectrum. Much wider than the visible spectrum. To say that UV kills bacteria is too much a generalisation. I copied this from a web site:


    # UV-A = 315 to 400 nm.
    345 to 400 nm = used for "Black light" effects.
    315 to 345 nm = are used for suntanning (some sun lamps also generate UV-B)
    # UV-B = 280 to 315 nanometers. Hazardous! Largely responsible for sunburn.
    # UV-C = 200 to 280 nm. Dangerous! Used to kill germs.
    # Vacuum Ultraviolet - 10 to 200 nm
    20 g reef, 72 g reef

  9. #9
    Moderator cres's Avatar
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    Plus, once you get to the 10 nm range, you are on the edge of x-rays. Which, you might say a) have good penetration and b) are not friendly long term.
    Sarchasm: The gulf between the author of sarcastic wit and the person who doesn't get it.

  10. #10
    Senior Member Bonaqua's Avatar
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    I'm talking 2x15W Integrally Filtered Tubes
    Wavelength: 365nm
    Intensity: 1.1mW/cm2 @10" (25cm).

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