Lighting question

Discussion in 'Lighting' started by Warr7207, 22 Feb 2008.

  1. Warr7207

    Warr7207

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    I am running 2 x T5's blue and 1 x metal halide -white

    Is it OK to run 2 x blue or should I have a white t5 ?
     
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  3. Mike

    Mike Retired Moderator

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    As long as the MH is covering the tank, i see no reason to lose a blue
     
  4. Ocean

    Ocean Lazy Sea Slug

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    are your blues on the back or front?
     
  5. Galibore

    Galibore Retired Moderator

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    Agree.
     
  6. Warr7207

    Warr7207 Thread Starter

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    Back or front of what? the tank ?
     
  7. Galibore

    Galibore Retired Moderator

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    Ocean I think they would typically be on both sides of the MH.
     
  8. lanzo

    lanzo Sponsor

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    Hey war,what is the kelvin of the MH?
    If it is 10000K and it covers your whole tank,then the 2 blues will be just fine, but imo if you are running a 13000k i'll add 1 white t5.
     
  9. Warr7207

    Warr7207 Thread Starter

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    It is a 10000K

    The reason i ask is the MH runs for 5 hours and t5's for 9 hours. When the MH switches off loads of coral also switch off
     
  10. lanzo

    lanzo Sponsor

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    Jaques talked about that corals only need 5hours of intinse light,he said that in the nature only 5hours of intense light will hit the corals.(it has something to do with the angel that the light hits the water, if it hit's at a 45 degree angel the light bounces off) something like that??
    It makes sense if one thinks about it, because the most light is between 10:00-15:00. and your MH is your sharpest light that replecates the sun?
    Hope this helps?
     
  11. Warr7207

    Warr7207 Thread Starter

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    OK, agreed, but my pincushions are only open 5 hours a day, you reckon that enough feeding time and photosynthesis ?
     
  12. lanzo

    lanzo Sponsor

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    I think 5hours for photosynthesis is cool.
    Some leathers feed at night, one of my leathers is only open at night and sometimes during day time, i don't know really why?
    Check out your pincushions at night when the whole room is dark?

    How far is your cushion from the MH?
    Is yor MH coverng the entire tank?
     
  13. Warr7207

    Warr7207 Thread Starter

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    Check out your pincushions at night when the whole room is dark? Totally closed

    How far is your cushion from the MH? 500mm
    Is yor MH coverng the entire tank? yeap
     
  14. lanzo

    lanzo Sponsor

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    well if your cushion is open for the 5hours that MH is on, then i'll think that he will be o.k
    If you have a really deep tank, i think you can get one more white globe but still keep the two blue ones

    A year ago i had problems with algae and bacteria, i had my MH on for 3-4 hours for a couple of months and my corals still grew.
     
  15. Warr7207

    Warr7207 Thread Starter

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    Cool thanks for the advice
     
  16. Warr7207

    Warr7207 Thread Starter

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    Is it possible to run a reef tank (SPS/LPS) with only 20000K lights ?
     
  17. Mike

    Mike Retired Moderator

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    Yes it is, but they tend to be rather blue in colour
     
  18. Warr7207

    Warr7207 Thread Starter

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    You mean the tank or the corals ?
     
  19. dallasg

    dallasg Moderator MASA Contributor

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    the globes, the light they emit
     
  20. Warr7207

    Warr7207 Thread Starter

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    OK, understand that, what I am trying work out is if all my lights can be blue.

    At present I run 40% Blue and 60% White.

    Can corals thrive under blue only ?
     
  21. Mike

    Mike Retired Moderator

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    Not as well as under lower K value lamps, corals actually prefer 4000k lamps, it is us that prefer the white/blue look to the tank.
     
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