Height of metal halides

Discussion in 'Lighting' started by gigman333, 13 Nov 2007.

  1. gigman333

    gigman333

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    hi all
    i have a open tank. is there any rule about the height of MH above the water level besides the heat generated i'm in the process of building a light stand
    from the bottom of the light fixture to the warer is about 16 cm will that be ok

    thanks
     
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  3. Galibore

    Galibore Retired Moderator

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    I think that will be fine Gig. Most people recommend 15cm - 20cm above water.
     
  4. OP
    gigman333

    gigman333

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    thanks galibore
     
  5. jacquesb

    jacquesb Retired Moderator

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    Hi Gigman/Galibore.... I have my 150 watt metal halides +-10cm above the water level.... And I have no heat issues w.r.t my MH's..... I think that if you go into many many 150 watts, or perhaps 250 watts/400watts, that heat and water-loss due to evaporation becomes a major issue.

    The only reasoning I would say to have your lights higher up, is salt spray/creep due to water movement at the water's surface, that could "cloud" your MH's cover glass (if it has a cover glass)....
     
  6. OP
    gigman333

    gigman333

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    thanks jacquesb
     
  7. Mekaeel

    Mekaeel Moderator

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    yeah 16cm is fine.mines is 20cm above water level
     

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