Is there a difference between 20000K and Actinic Lights ?

Discussion in 'Lighting' started by Warr7207, 17 Mar 2009.

  1. Warr7207

    Warr7207

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    Is there a difference between 20000K and Actinic Lights ?

    Is it just marketing buff ?

    If there is a difference please explain.
     
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  3. brettb2020

    brettb2020

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  4. Warr7207

    Warr7207 Thread Starter

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    Thanks for the link Brett

    So 20000K are better for coral growth and actinic for colour ?
     
  5. jacquesb

    jacquesb Retired Moderator

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    Yes Warren - exactly. The 20000K globe is just a variation of the white color. Where as actinic, actually shows off the "flourescense" of corals.....
     
  6. Warr7207

    Warr7207 Thread Starter

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    Ok, so how do I tell the difference between the two. Often products are just listed as Blue ??
     
  7. jacquesb

    jacquesb Retired Moderator

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    No Warren - the 20000K globes should never be sold as "blue". They are actually white with a "bluish" tint....

    You also get a difference between the "blue" globes, and true actinics.... The true actinics will (like ultra-violet light - black-light), make white colors "shine" like flourescent, and other (certain) colors "stand out" like flourescent.

    The "blue" globes does not have so much of a pronounced effect.....

    Basically - as far as I know - true actinics make the colors "glow" far more, than "normal blue globes".....
     
  8. brettb2020

    brettb2020

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    no problem:thumbup:
     
  9. Warr7207

    Warr7207 Thread Starter

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    Thanks Jacques, so what is this globe ?

    Aqua Medic T5 Reef Blue
    Aqua Medic : Seawater Catalogue : The Light : aqualine T5
     
  10. Bob the (reef)builder

    Bob the (reef)builder

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    Actinic, as far as I know was a happy coincidence that was designed for the printing industry and adopted by reefers as it made their blues and greens look good and flouresce.

    I'll check the reef blue when I get to the shop, Warren, but I think its a higher than 20 000k bulb.
     
  11. Shaun

    Shaun Retired Moderator

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    Bob I remember reading something about the history of Marines and they mentioned the first guys using some medical light used in hospitals for "Actinic".
     
  12. Falcon

    Falcon

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    WARR rather get a pure actinic tube like the one from geisseman etc.

    however judging from the diagrams on the link you posted that reef blue doesnt have much emmitted yelowish light and also peaks (and is quite densely packed) around the 420nm mark,i would say its rather very very close to pure actinic.

    so in my book i would run it as actinic.
    unfortunately the best actinic i've ever come across is only available in T8:( its made by
    ZOO MED and its the CORAL SUN.so now i'm using gesseiman
     
  13. Midasblenny

    Midasblenny

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    Yeah the actinics from Philips also come in T12 sizes are really impressive TLD is what they call them, not a bulb that one can easily look at as it disturbs the eyes.
     
  14. aslam

    aslam

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    Guy's just to confirm,is it possible to keep corals only under 20 000 kelvin bulbs.I ask as I have seen alot of reefers tank's in overseas forum's do this.Don't mean to hijack the thread.
     
  15. Rory

    Rory Admin MASA Contributor

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    Got 2 of those on my tank. More purple than blue. Make your eyes go very funny...
     
  16. viper357

    viper357 Admin MASA Contributor

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    I believe those are one the few "true" actinic tubes, they run at 140w.

    Here's another thread discussing these lights Phillips Blue T8 - Lighting
     
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