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  1. #1
    Senior Member RaceFaceR1's Avatar
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    Actinics??? Do I really need them?

    Alright I read mix feeling about this?

    I resently upgraded my lighting to 2 x 250W MH 14K. It seems like some don't use Actinics at all with MH 14K or 20K?

    What are your thought on this?

    I'd like to hear some imput!

    Thanks,


    Marc
    180G - Reef
    29G - Goldfish

  2. #2
    Senior Member reefmutt's Avatar
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    some people try to simplify the lighting by not using actinics when they are using higher kelvin bulbs- since they are bluer already.
    I'm not a fan of this method. First, on an aesthetic note, actinics ALWAYS make the corals look better, more colourfull. But more importantly, most higher kelvin bulbs actually have their spectral blue peak in the 460nm range- not in the true actinic range(420nm) so in this case, I'd also opt for actinic supplementation.
    Matt.

    Old system torn down to make a playroom.. planning a 62x42x28 high

  3. #3
    Senior Member RaceFaceR1's Avatar
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    That is what I was originaly planning...

    Now how many Actinics should I have in there? 2 x 3' VHO's? Where should I put them in my canopy? One in the front the other in the back?
    180G - Reef
    29G - Goldfish

  4. #4
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    I used to run only 20k's and STILL ran actinics. I agree with Reefmutt on this subject.
    Yes one in the back and one in the front would be good even coverage.
    This topic was just covered last week below.

    http://aquariacanada.com/forums/show...&threadid=6383

  5. #5
    Senior Member Flame*Angel's Avatar
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    I read a thread by Eric Borneman on RC a while ago about this. He said basically the same thing ReefMutt did, corals do use actinic and it's not the same as a bluer metal halide bulb.
    Susan

  6. #6
    Senior Member ALRHA's Avatar
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    interesting. i always figured my 20k bulbs act as actinics. guess not.
    Albert
    My Photos

  7. #7
    Senior Member Cmarty01's Avatar
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    How do corals use actinic? The sun is not actinic, so why would it benefit them. I see why it benefits us (nicer colours), but where does the actinic come from in nature?
    55 Gallon w 22 lbs of live sand and 40 lbs of crushed coral.
    60 lbs of live rock. 220 watts PC lighting.

    Damsel, clowns, xenia, digitata, green star polyps, torch, zoo's, candycane, shrooms.

  8. #8
    Senior Member
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    Cool

    corals will do just fine without actinics, what there saying is the corals seem to use the actinic lighting by fluorecing [spelling?] really nice for our viewing pleasure. as well as the fish. also, in water blue wave lengths travel deeper than say green and yellows and reds.someone else can probaly elaborate more than me. also, the sun does have actinics.

  9. #9
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    White light is composed is of light with different wavelenght. The wave lenght of light is link to the energy of that light. The shorter the wave are , the more energy there is. Red light is less energyfied (dont know if that word does exist!) than blue one and this for that reason that blue light can go deeper in water.

  10. #10
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    As you can see in that picture of the composition of an USHIO 400W MN bulb, The light that it produce is composed of all the color but there is slightly more blue than the other. (I don't understand why, because I have always found these bulb more yellow green than blue ...)

    If this is true that coral growth better with a supplementation of blue, it would mean that it use that wavelenght to do photosynthesis, I always have thought that this was like plant and that it use green to do photosynthesis???

    Steve

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