New Lux Meter to check lighting for a mixed reef aquarium

Discussion in 'General Equipment, Hardware, Filtration' started by sdavi66572, Jan 12, 2017.

  1. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Leader Photo of the Month Award Build Thread Contributor

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    Sorry. Most Led run in a blue white ratio. so both at full intensity.

    On a pac sun MH t5, you shouldn't really worry about imo. thats great light w plenty of PUR too. But the info could be useful. And if you see intensity dromp over time in lux it could help trouble shoot.
    If your running a 14k mh and and 2 blue t5 id do the math at 45 to average. Keep in mind your making an estimate

    If I had your light based on those colors Id run 40, 45 and 50 to get the range.

    50,000/40= 1250
    50,000 / 45 =1100
    50,000/50= 1000

    Additionally id meter the led separately as well as Id doubt it contributes significantly to both Intensity and Par. ie 1000 lux moonlight/60(for led,) = 16 par
     

  2. mcarroll

    mcarroll Valuable Member R2R Supporter R2R Excellence Award

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    I agree.....I would simply divide by 50 (because it's easy to do in my head) and think of it as "around 1000 PAR". There really isn't a need for more accuracy than this.

    They say intensity drops by about 1:2 in air....or if you double the distance from the light source, you halve the amount of intensity.

    I think it's close to 1:4 drop in water, but that's a less precise estimate than in air as water and its constituents have a much more pronounced effect on light. I think it's still close enough for our purposes....and I think if you look at some PAR maps (if you can find some with enough detail) you'll see this 1:4 trend.

    I never bother with this level of figuring though.....but if you were (for example) to bring a large coral home from another established system, you might want to find a spot in the tank that was likely to have the same light, so maybe it would be worth it then.

    Myself, I would either ask them to measure the light directly over the coral (sensor should cast a heavy shadow on the coral/spot in question) or take my meter and measure it myself. Then with the meter over my tank, in a spot of similar intensity, I can see where the shadow falls and have a great idea where to start with placement.

    Make sense? Harder to explain than to do. :) Getting a lux meter and just using it for the tank and other things will answer a lot of questions. It's a complicated subject, yet not nearly so mysterious as it sometime seems to be. :)
     
  3. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Leader Photo of the Month Award Build Thread Contributor

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    acclimation is key.
     
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  4. Syntax1235

    Syntax1235 Active Member

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    Just for clarification.... the Pacific Sun fixture is LED/T5.

    Thanks for all the good information.

    I guess when I get readings I can post them here for comments?
     
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  5. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Leader Photo of the Month Award Build Thread Contributor

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    gotch, Meter both individually, to see the intensity ratio then average at a higher conversion number as we did with Mh t5.
     
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  6. sdavi66572

    sdavi66572 Active Member

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    My lenses are a combination of 90 and 120. I went a head and bump my lights back up to 62000 lux at the surface of water. I have not tried to use a zip lock bag to check at different levels. I will try and check tomorrow. Still in the process of getting my phosphates down, currently at .07. Im going to post some photos.
     
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  7. mcarroll

    mcarroll Valuable Member R2R Supporter R2R Excellence Award

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    .07 ought to be pretty good. You definitely want relatively higher nutrient levels to support the higher light levels. If PO4 becomes limited, it's almost always a bad thing.
     
  8. sdavi66572

    sdavi66572 Active Member

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    tank 112.JPG tank 122.JPG tank 120.JPG
     
  9. mcarroll

    mcarroll Valuable Member R2R Supporter R2R Excellence Award

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    Nice!!
     
  10. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Leader Photo of the Month Award Build Thread Contributor

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    Yea super nice.
    If I may, Id suggest looking into some more snails. My new batch of turbos just cleaned house on my powerheads, they look new.
     
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  11. Syntax1235

    Syntax1235 Active Member

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    Got my meter in today... I had enough time to get a reading of my t5's.... The meter read between 185-195 on the x100 setting... What does that translate to par? The meter was approximately a foot from the top of the water and the tank is a 125 gallon, about 21 inches deep.


    Edit:

    ok.... so about 385 par (divided by 50) at waters surface... go down 12 inches and corals are receiving 96 ( divided by 4) par and at the bottom of the tank about 30 (divided by 4 again). Does this sound right? Again... this is from the t5's only. I need to wait for the weekend to get a reading on my led's when I'm home at peak intensity.
     
    Last edited: Jan 17, 2017
  12. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Leader Photo of the Month Award Build Thread Contributor

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    so, 20,000 divide by 40. What fixture and tubes? how high above the tank?
     
  13. Syntax1235

    Syntax1235 Active Member

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    It's a Pacific Sun Hyperion.... led with 4 t5's on each side of the LED's..

    Each side of t5's is about 200 on the x100 setting. The light is about 1 foot above the water. I took the reading just above the water.

    Tubes are ati.. coral and blue plus on one side and a coral and aqua blue on the other side.
     
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  14. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Leader Photo of the Month Award Build Thread Contributor

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    That sounds about right. It should be about 400 to 500 par at the top of the tank.
     
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  15. Salty1962

    Salty1962 Wrasse and SPS Lover R2R Supporter Reef Squad R2R Excellence Award Build Thread Contributor Partner Member 2018

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    Milwaukee MW700 is water proof;)
     
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  16. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Leader Photo of the Month Award Build Thread Contributor

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    you like it. huh.
     
  17. Syntax1235

    Syntax1235 Active Member

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    Then divide the par by 4 for every foot of submersion?

    12 inches deep would be about: 125 par
    Bottom at 21 inches: 35 par.

    Sound right?
     
  18. saltyfilmfolks

    saltyfilmfolks Lights! Camera! Reef! R2R Supporter R2R Excellence Award Reef Squad Leader Photo of the Month Award Build Thread Contributor

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    Im not sure on that one honestly.
     
  19. Salty1962

    Salty1962 Wrasse and SPS Lover R2R Supporter Reef Squad R2R Excellence Award Build Thread Contributor Partner Member 2018

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    I haven't received it yet but the reviews look good on it.
     
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  20. Esage

    Esage Valuable Member ETRC Member

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    Whats a good LUX reading on a 16" deep tank with mostly softies and LPS? Should I be shooting for around 30,000 LUX? Would that be considered medium light and 20,000 Low light?
     
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