LED Question's

Discussion in 'Lighting' started by Gummi Bear, 5 Sep 2012.

  1. Gummi Bear

    Gummi Bear

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    Hi, Guys,
    I have a question,
    What Leds is better to have for growing corals ,
    Royal Blue 455NM, Blue 450nm, or cool white leds @ 12000-14000k
    Reason for this is I am designing a LED unit for my Self,
    And this is what I came up with
    [​IMG]
    The Unit will be about 900 Wide and will have 77x3 led Epistar Leds in them,
    It will have 7 stars like the attached picture and have the following LEDS as indicated in the Picture, I need help in regards to if this design will give me good colour and growth
    Should I change 5 whites and 4 blues or 5 blues and 4 whites?
    the 525nm is green and the 630nm is red?

    I will have 2 of these units over a 1,8m tank.
    Thanks
     
    Last edited: 5 Sep 2012
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  3. saaid

    saaid

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    Get a big enough card board and draw out your pattern or color scheme. From what I can man make out is that you will have 3-4-3 or a 4-3-4 formation on it back to front? If you do it as you plan too I think you will end up with a cluster of white led's in certain areas.
     
  4. butcherman

    butcherman Moderator MASA Contributor

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    What are the dimentions of your heat sinks?

    What optics do you plan on using?
     
  5. JS

    JS

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    Hi, I have been using a 50/50 mix of Extreme Royal Blue (445nm) and 20 000k Whites.....and have insane coral growth....

    With my previous PL Tubes nothing grew in my tank....the moment I changed it started growing...
     
  6. butcherman

    butcherman Moderator MASA Contributor

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    I dont think the reds and greens offer much benifit. If you look at the cool white spectograph it has green and red components in it.
     
  7. Wes

    Wes

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    replace pink with UV
     
  8. Toolboysa

    Toolboysa Moderator

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    [​IMG]
     
  9. JS

    JS

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    With butcherman on this....dont waste money on red and green....rather spend cash on some decent LED's....

    CREE has a new violet LED....very nice.....colour looks awesome on its own.....
     
  10. butcherman

    butcherman Moderator MASA Contributor

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    [​IMG]
    cool white for growth

    [​IMG]
    to make the colours pop!
     
  11. Sammy

    Sammy

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    I'm guessing you meant 77x3W LEDS, that seems quite a bit of 3W LEDS for 900mm, are you planning to use fan assisted cooling ?
     
  12. Gummi Bear

    Gummi Bear Thread Starter

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    All of them Will have 90 degree optics, Not to sure what heat sinks will be used as this be a full unit, pre-built, in which I can chose what leds are needed,
    So you guys think That instead of having 5 white and 4 blues , i should have rather have 5 blue and 4 white ,
    I can choose any white leds from 3000k to 20000k ,
    So for my tank which is 1,8m by 500 and 600 deep I will have 2 of these units which is a total of 154x3watt leds which 462 watts in total, the complete unit will look like something like this

    [​IMG]


    [​IMG]


     
    Last edited: 5 Sep 2012
  13. Gummi Bear

    Gummi Bear Thread Starter

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    Problem, is that with Cree leds the unit works out too expensive, that is why i went with Epistar
     
  14. Gummi Bear

    Gummi Bear Thread Starter

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    @butcherman, Do you suggest that I leave out the Green and Red, and have 3 royal blue, 3 blue and 5 White at about 9000k .
     
  15. Francois

    Francois

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    Hey Angamia


    I would go for 70 Luxeon es 3 watt leds from stevesleds.com on one heat sink they are much brighter and cheaper than cree and make 7 clusters of ten leds like this on your heat sink:




    ---RB-CB-RB---
    --V-NW-NW-V--
    ----C-RB-DR---


    So in total you'll need:


    RB x 21
    CB x 7
    NW x 14
    TV x 14
    DR x 7
    C x 7


    Hope this helps you out
     
  16. Toolboysa

    Toolboysa Moderator

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    I cant find a spec sheet for those epistars.

    Of all the specs Ive seen I would either go CREE or Luxeon ES. Both are awesome
     
  17. Francois

    Francois

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    Some info on the led optics. All optics will reduce overall LED light output to some degree. For maximum LED efficiency and lifespan situations, optics are not recommended.

    -For tanks up to 30 inches deep, no optics required.
    -For tanks deeper than 31 inches, 90° will be ideal
    -For tanks deeper than 41 inches, 60° will be ideal
    -For tanks deeper than 51 inches, 30° will be ideal
    -For tanks with enclosed hoods, optics are not required, because LED light is very reflective, meaning it will reflect on the inside of your tank glass down to the sandbed, with a negligible amount actually escaping*outside*of the aquarium. *Remember that the Law of Reflection states that the angle of reflection equals the angle of refraction.

    -For tanks with no hoods, where the LEDs will be mounted more than 12" above the water, consider using at least 60° optics and for distances greater than 20" inches above the water, use 30°
     
  18. butcherman

    butcherman Moderator MASA Contributor

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    There is no 100% correct answer here as it depends on what viewable colour you want and if you can dimm diffrent colours.

    Personnaly i like the blue look (20000k up) and i love getting the colours to pop out at me.

    For a build this big, I would maxamise the blues i put in.


    I might also consider only using all Royal blue Led's rather than mixing with normal blues(especially if you cant dim diffrent colours). To slapsh out i might include a uv every now and then


    Important to consider:
    Are these units dimmable? and if so how?
     
  19. Toolboysa

    Toolboysa Moderator

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    What are you planning on keeping? SPS LPS Softies?
     
  20. butcherman

    butcherman Moderator MASA Contributor

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    Good guide lines here.

    I think most LED's these days have a viewable angle of 120 degrees when unlensed.

    You will need to consider the hieght you are mounting the led unit above the water. the configuration you are looking at seems to have a very narrow heatsink.
    The reult the light will be very focused once you lense them and if you mount them to close to the water surface. Your resulting foot print might be reduced so that you do get dark spots either infront or at the back (i assume your tank dimentions are 1.8m x 0.6m x 0.6m or close to it)

    Can you confirm your tank dimentions?
     
  21. Gummi Bear

    Gummi Bear Thread Starter

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    This unit is not Dimmable, so it would be better to go with 6 Royal Blue Leds, and 5 20000k white Leds ,,

    Thanks to all for the replies
     
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