LED wattage to Gallon ratio ?

Discussion in 'LED Aquarium Lighting' started by cpc12, Sep 25, 2011.

  1. cpc12

    cpc12 Spanish Shawl Nudibranch

    Joined:
    Sep 23, 2011
    Messages:
    91
  2. Click Here!

  3. thepanfish

    thepanfish Flying Squid

    Joined:
    Jan 1, 2010
    Messages:
    3,030
    Location:
    Michigan
    Watts per gallon is irrelevant, especially with LEDs.
  4. loneracer05

    loneracer05 Clown Trigger

    Joined:
    Jun 2, 2009
    Messages:
    2,019
    Location:
    long island ny
    You should be plenty fine with that fixture
  5. Ashevillian

    Ashevillian Pajama Cardinal

    Joined:
    Jun 27, 2011
    Messages:
    1,407
    Location:
    Asheville, NC
    then when we are choosing LEDs to set up, what are we suppose to look for if not wattage? The name brand?
  6. sticksmith23

    sticksmith23 Giant Squid

    Joined:
    Jun 1, 2011
    Messages:
    4,054
    Location:
    WA
    You look at PAR, more or less it's all about the PAR values at any given depth that will tell you what can or can not be kept in a tank under certain lighting.
  7. Ashevillian

    Ashevillian Pajama Cardinal

    Joined:
    Jun 27, 2011
    Messages:
    1,407
    Location:
    Asheville, NC
    I have a 29g Biocube that has a depth around 15"

    What do you think of the 3watt Luxeon LEDs? How many RB and CW's do you think I would need to grow clams and SPS?
  8. Click Here!

  9. cain

    cain Astrea Snail

    Joined:
    Jul 27, 2011
    Messages:
    57
    multiply your tank's lenght x width, you'll get the surafe area, divide the surface area by;
    10 if you want to burn your corals bright
    15 if you want SPS (most people use)
    20 for LPS/softies
    ----------------
    after you divide the surface area, that's the number of LED's youd want.


    you cant go with watts/gal with LED's.
  10. DBOSHIBBY

    DBOSHIBBY Wobbegong Shark

    Joined:
    Jul 27, 2009
    Messages:
    2,502
    Location:
    Detroit, MI
    Thats not a very good way to do it either. optics and brand of led will change that very quickly.
  11. mikejrice

    mikejrice 3reef Affiliate

    Joined:
    May 24, 2009
    Messages:
    5,284
    Location:
    Colorado
    As well as depth of tank.
  12. DBOSHIBBY

    DBOSHIBBY Wobbegong Shark

    Joined:
    Jul 27, 2009
    Messages:
    2,502
    Location:
    Detroit, MI
    +1
    i have 5 par38s over my 65g so that would be 25 leds. so according to that math i would be below the lps amount of leds. yet i have sps and a clam on the sandbed.
  13. m2434

    m2434 Giant Squid

    Joined:
    Jan 11, 2011
    Messages:
    3,478
    Yeah, I've seen this formula on another forum. As others mentioned, there is no consideration of brand, optics or depth. So, yeah agree, pretty much useless.... Lighting is always tricky to estimate, LEDs especially so.
  14. Click Here!

  15. evolved

    evolved Wrasse Freak

    Joined:
    Feb 26, 2010
    Messages:
    4,012
    Location:
    Phoenix, AZ
    Agree with the last comments posted; there's no 'easy' rule to follow.

    Depends on the tanks dimensions, optics desired, what you're keeping, and what diodes you're using.
  16. thepanfish

    thepanfish Flying Squid

    Joined:
    Jan 1, 2010
    Messages:
    3,030
    Location:
    Michigan
    PAR readings at different depths, spread, optics
  17. Ashevillian

    Ashevillian Pajama Cardinal

    Joined:
    Jun 27, 2011
    Messages:
    1,407
    Location:
    Asheville, NC
    my surface area is 300" so that would mean around 20 leds, which is the rate that i've seen.

    However for example you have Cree, Luxeon, and Epistar... I believe Luxeons have the best PAR output, so where you would need 30 Epistars I will only need 20 of the Luxeon
  18. thepanfish

    thepanfish Flying Squid

    Joined:
    Jan 1, 2010
    Messages:
    3,030
    Location:
    Michigan
    300" square,cubed? Can we get dimensions?
  19. Laborator

    Laborator Astrea Snail

    Joined:
    Jun 16, 2011
    Messages:
    36
    Let me know how that light works I was looking at that as well.
  20. Click Here!

  21. cain

    cain Astrea Snail

    Joined:
    Jul 27, 2011
    Messages:
    57
    turn down the current if you're using optics.
    with regards to brand i was thinking cree, not the xml.

    use optics, or turn the current up, if you dont sue optics lower your fixture near the water.

    many ways of skinning a cat.
    what i posted is a rough idea on how to come up with a number of LED's without using the watts/gal.
  22. Ashevillian

    Ashevillian Pajama Cardinal

    Joined:
    Jun 27, 2011
    Messages:
    1,407
    Location:
    Asheville, NC
    biocube dimensions are 15" tall 15" deep 20" wide

    from the research that i have done it appears Luxeons are the newest and best LED lights available for a fair price, looks like they are much better than the Cree
  23. cain

    cain Astrea Snail

    Joined:
    Jul 27, 2011
    Messages:
    57
    if you dont want to go with the length x width divided by x number, you might want to go to reefledlights, they compare the number of led's against those of a metal halide 150watts upto 450watts. so if you want to get same par as metal halide 450 watts, they tell you how much led you need. if you want to match the par of a 150 watt MH, they also tell you that.