Selecting a LED Fixture - By Steven Pro

Discussion in 'LED Lighting Specific' started by revhtree, Sep 15, 2011.

  1. twilliard

    twilliard Delayed -- school R2R Supporter R2R Excellence Award Reef Squad Partner Member

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    Its a meter that you can use to measure the par output of the fixture at different levels
     
  2. arman

    arman Well-Known Member

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    Im not sure but we have some thing here named kelvin meter,but its very expensive and i cant afford it
     
  3. arman

    arman Well-Known Member

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    i had an other question
    iv seen in some shops they use colorful LEDs on reef tanks is that good or not????
    for examole pink, purple ,green, yellow,etc..
    Do reefs survive undre this kind of lightning????
     
  4. Thomas36

    Thomas36 Member

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    Does led lighting have a spectrum like regular lighting? and if so what spectrum should we be looking for if you were thinking about doing corals
     
  5. Tyler001

    Tyler001 Member

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    I would highly recommend a reef breeders I love the three I've had they are really strong though almost to bright when turned up over 90 percent my pics don't do this light justice it doesn't look as blue as the picture looks in real life all the colors pop out. Plus seeing great coral growth. One pic with the green star polyps up top is my 65 gallon with a 24" reef breeders photon then the othe tank is my 120 gallon with the 48" I upgraded tanks and sold the old tank. I'll put up recent pics of the 120
     

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  6. Ductigamist

    Ductigamist Member

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    I need some appropriate suggestions...I've gotten all sorts of answers and am now just overwhelmed with options...I've got a 45 gal bowfront 36" wide 20" deep...what are some specific recommendations...I'm not looking to handle clams or SPS, so I don't think I need the most powerful units
    Thanks in advance
    Art
     
  7. millertyler22

    millertyler22 Well-Known Member

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    It depends on how much u truly want to spend. Remember the most expesive is not always best personally I use to of the eBay dimmable black box led they r inexpensive but if I had the money I would have bought radions just read all the choices out there and set a budget.
     
  8. Tyler001

    Tyler001 Member

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    Reef breeders leds all day The 24" would work great for any tank 36" I had it on a 60 gallon here it is. Amazing colors growth and health and ease of use the pic is the 60 gallon I have a 120 currently with the 48" reef breeders

    image.jpg
     
  9. SomethingFishy1980

    SomethingFishy1980 Member

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    Anyone have any input on either the Hydra or the Radion leds? I'm trying to make my decision on the world of led reef lighting. I have LPS but just added some montipora and I wanna get into the sps
     
  10. NightStar

    NightStar Active Member

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    Thoughts on RapidLED Onyx lights? I heard they compare to Radions?
     
  11. Thomas36

    Thomas36 Member

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  12. timkenagy

    timkenagy ~Unashamed 116~ R2R Supporter

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    It's what I run over my display. I'm completely satisfied with them.

    Here's a video.
     
  13. dacianb

    dacianb Well-Known Member

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    In my humble opinion, buying a LED fixture I would look for:
    - brand and type of LEDs - we cannot dream to see flux / color bins on a fixture, but yeah, this would be more pricey. Those binnings are the main reason that not 2 lights are identical (even the same model of fixture can have 20-30% difference just thanks to unbinned LEDs). But also hate the "ultra efficient LEDs" slogan on some lights
    - take the published power and consider only 75% of it in best case. All LEDs manufacturers websites publishes graphs and studies on which conditions have a light fixture to fulfill in order to be able to power a LED at 100% power. I have doubts that a small heatsink and a cheap fan can keep dozens of LEDs in a low enough temperature. As result the lifetime of LED drops (read intensity level in next few months) and in worst case color shifts. I would never power a led at more than 75% current without knowing lot of thermal details.
    - leds to be clustered as close possible - to avoid ghosting / disco effects
    - personally I consider collimators useless and prefer bare leds, as much wider / uniform spread. Someone will tell me that with collimators PAR values increase, etc. Agree, increase locally, right under the light. Keeping uncollimated LEDs I dont lost energy - everything is there, in the tank, everywhere. I can place corals everywhere in the tank, no risk to burn them, not risk to underfeed them.
    - everybody admits that corals needs 400-500 nm spectral range to grow, with highest peak at 450 nm. Great. But then why PAR is an essential parameter?? PAR means radiometric power measured on 400-700 nm interval.
    Having a lime/green/yellow light will show a huge PAR reading, but I will should not try it above a reef tank. Probably algaes will explode :). Lumens / Lux are also useless parameters as are related to human eye sensitivity (V lambda curve for who needs more details) and will show you couple of lux on a high power deep blue led. I would consider radiometric power in 400-500 nm interval as the main parameter. All other wavelengths (500-650) - greens, yellow, red, far red, lime and whatever other leds are on market are for visual appealing of tank only. Not influencing the corals.
    - safety features of the lights - what happens if the 2USD fan breaks? What if airflow is clogged? Will a thousand $ light just burn out?? Most probably components as fans have a much shorter lifetime than a well cooled/decently powered LED, so a nice way to replace it / clean it is essential.
    And other details which convinced me in the end to not buy, but to build my own lights... If something goes wrong I can look into mirror, blame myself and repair/improve :). Easier.
    There are manufacturers of LED lights which provide books of details on the lights, including X-Rays for LEDs soldered on boards to prove that there are no micro air-bubbles in the solder to affect the thermal transfer... Sadly non of those guys plan to build reef lights :). Hopefully the hobby market will mature someday and real pro lights will pop on shops.
     
  14. Thomas36

    Thomas36 Member

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    That tank is beautiful I hope to get the one day
     
  15. scardall

    scardall Well-Known Member R2R Supporter

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    Last edited: Jan 10, 2016
  16. scardall

    scardall Well-Known Member R2R Supporter

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    dacianb likes this.
  17. acer

    acer Well-Known Member PMAS Member

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    WOW- now that is a write up!! my head is spinning......
     
  18. scardall

    scardall Well-Known Member R2R Supporter

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    I think you might enjoy this read at this lighting link: http://www.americanaquariumproducts.com/Aquarium_Lighting.html
     
  19. dacianb

    dacianb Well-Known Member

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  20. scardall

    scardall Well-Known Member R2R Supporter

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    Curious, Like what and why?
     

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