Metal Halide

Discussion in 'Lighting' started by Warr7207, 19 Feb 2008.

  1. Warr7207

    Warr7207

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    is there a huge difference between running white or blue halides ?
     
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  3. Mike

    Mike Retired Moderator

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    I don't think you would get a good Actinic metal halide, the light would be too strong, if indeed you could find the lamp in the right K range, but the actinic is a much subtler light for dusk and dawn light rather than a blast of light from MH
     
  4. Warr7207

    Warr7207 Thread Starter

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    I have a blue halide, what is this ?
     
  5. Mike

    Mike Retired Moderator

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    It's a halide, not a T5? what does it say on the lamp?
     
  6. Warr7207

    Warr7207 Thread Starter

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    I take a photo in an hour and post, going home now.
     
  7. Mike

    Mike Retired Moderator

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    Another half day then:whistling:
     
  8. Mekaeel

    Mekaeel Moderator MASA Contributor

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    MH 6500k excellent growth on your corals but your tank will look yellow,needs to be supplemented with lotsa actinics
    10 000k good growth and crisp white colour
    14 000k fairly good growth and has a hint of blue to it
    20 000k is blue,looks good but less growth as compared to the above
     
  9. Warr7207

    Warr7207 Thread Starter

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    Here you go

    [​IMG]
     
  10. Warr7207

    Warr7207 Thread Starter

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    [​IMG]
     
  11. Mike

    Mike Retired Moderator

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    What is the Kelvin rating?
     
  12. Warr7207

    Warr7207 Thread Starter

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    Doesn't say
     
  13. Kanga

    Kanga Retired Moderator MASA Contributor

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    Normally on the flap there is a small sticker or rubber stamp that says 14 000K or so
     
  14. Warr7207

    Warr7207 Thread Starter

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    My sticker just has barcode and MegaChrome 150w coral
     
  15. Alfie

    Alfie

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    I think the blue light is 21 000K
     
  16. Warr7207

    Warr7207 Thread Starter

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    OK, let's say it is 20K blue, difference between the different ratings ?

    As per Mekeel ?
     
  17. Mike

    Mike Retired Moderator

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    Googled it, if you want anything done round here you have to do it yourself:lol:

    22,000k:whistling: it will be "blue" but a pure blue actinic is higher than that, in the region of 35,000k i think
     
  18. Alfie

    Alfie

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    Just as he says, looks good,no need for strong actinic but slower growth rate.
     
  19. Obi-Wan

    Obi-Wan

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    Yup, beeeg diffs

    Dunno if this fills any gaps in?

    I know these metal halide lamps:
    megachrome 150W blue
    marketed by deltec, developed together with Giesemann Lichttechnik

    It's meant to accentuate, supplement, or simulate "Reef at DEPTH" appearance. Also intended for moonlight/phase simulation if appropriately mounted, and controlled.

    I suppose only useful in the latter respect, in larger tanks(2m up)

    The manufacture states > 20 000K, but also rates at ~21 000K.

    Meant to be used as above in conjunction with SPECIFIC light types.

    With ACTUAL CORAL GROWTH, or PHOTOSYNTHETIC stimulating in mind, you would HAVE to employ ''WHITER LAMPS'' on their own, or in addition to the 150W blue, or according to the "LOOK" you want

    Those easily available in SA.
    6500/10 000/12 000/14 000 K


    The diff between white and blue, is easiest stated as the difference between sunlight and moonlight.

    Which would you expect to grow a thriving Photosynthetic Reef under?
     
  20. DragonReef

    DragonReef

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    Thanks Liaquat.

    I think those lamps were originally intented for FOWLR systems to accentuate colours on exotic Angels and Butterflies. Probably been adapted by Reef Keepers to supplement deep reef scenarios in conjunction with Higher PAR lower kelvin lamps.

    150W MH lamps generally lack suffucient PAR at depths greater than 30cm and then nothing higher than 14k.

    HTH.
     
  21. Reef Maniac

    Reef Maniac MASA Contributor

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    Umm.... YES

    I think the one is bluer than the other :whistling:


    Sorry, could not resist :)

    Hennie
     
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