LED lights - what percentage

Discussion in 'General Equipment, Hardware, Filtration' started by dcom, Sep 14, 2017.

  1. dcom

    dcom Well-Known Member

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    Hi guys,
    I have a SB reef (box) on my reef tank and I have been increasing its intensity every week, little by little.
    I know there shouldnt be at 100% but dont really know how high I should keep going.
    They are ~6 inch above water level and currently at ~40% for both the blue and the whites.
    Any experience with these or other LEDs?
    Thanks
     
    Last edited: Sep 14, 2017
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  2. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Photo of the Month Award

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    How deep is your tank?
    And do you have high rock structures?

    40% is probably not a bad ballpark for most anything.
     
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  3. dcom

    dcom Well-Known Member

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    I do have high rocks.
    Tank is 18inch total.
    Highest rock is 11 inch
     
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  4. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Photo of the Month Award

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    K. Mine is 14 in above the water and at 75%. Corals to the top clams on the bottom.

    An inexpensive way to test is with a lux meter. Btw.

    Every 6000 lux is approx 100 par.
    A Lux meter is about $15 on amazon.
     
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  5. dcom

    dcom Well-Known Member

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    Thanks salty!
     
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  6. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Photo of the Month Award

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    You bet!! I love those lights. Let me know if you need help.
     
  7. dcom

    dcom Well-Known Member

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    Hey Salty,
    I want to know where my numbers are and just ordered a Lux meter!
    May I ask what the recommended numbers are in your opinion?
    I've found lots of contradictory info about readouts on LED fixtures.
    Thanks
     
    Last edited: Sep 19, 2017
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  8. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Photo of the Month Award

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    I would meter them first. Then look for about 25,000 to 35000 lux.

    I run that 35k for 8 hours a day. But I also have a very long ramp time.

    If you don't have the ramp choose the 20k and you can probably go 10 12 hr. But watch the corals.
     
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  9. dcom

    dcom Well-Known Member

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    Thanks for your quick response man.
    One more question.
    35000lux at what level? Next to the LED ligths or at water level?
    This is obviously not my area of expertise...
     
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  10. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Photo of the Month Award

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  11. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Photo of the Month Award

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    Just keep acclimation in mind. Large adjustments like 200 or 300 par can be bleach stuff.

    6000 lux is close to 100 par. And that's usually an ok adjustment.
     
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  12. dcom

    dcom Well-Known Member

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    Thanks Salty!
    You are the man!
     
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  13. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Photo of the Month Award

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    You're welcome!
     
  14. dcom

    dcom Well-Known Member

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    Hi Salty,
    I did some measurements and it varies a lot.
    Lux is about 400 at the center of the tank and as i move away to the corner it goes to 270, 150, 32 and 15.
    Do you think that is ok?
    Should I lowered it down cause is so high at the center?
    Or should I increase it a bit cause is so low at the corners?

    my tank is ~23 inch long.
    My SB light box is about 16 inch long.
    Box is at the center of the tank.

    Thanks
     
  15. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Photo of the Month Award

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    400?
    Or 40,000?
    There's an X 10 x100 function on the meter.
     
  16. dcom

    dcom Well-Known Member

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    Sorry yeah, 40,000.
    All my values x100
     
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  17. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Photo of the Month Award

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    A little bit is quite likely the hot spot your metering.

    Think about a flashlight hitting a table in front if you. It's brightest in the middle of the circle and less at the edges.
    Raising the light makes the hot spot cover the area more evenly.

    Some folks if they can't raise the light more , will remove some of the lenses or add a diffusion to the light.
     
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  18. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Photo of the Month Award

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    It's probably fine, it is a lot of light.

    I generally Reccomend about the 25,000 to 35000 mark. 35 on the very high end.
     
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  19. dcom

    dcom Well-Known Member

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    OK thanks man !
     
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