LED Q&A thread

Discussion in 'DIY' started by Gomer, Sep 24, 2009.

  1. Gomer

    Gomer Honorary Member

    You can drill and tap the heatsink pretty easily if you have access to a manual mill. I wouldn't tackle it with a drill press.
    That said, even with mill access, I'd be highly tempted to use these: http://www.luxeonstar.com/Pre-Cut-Thermal-Tape-for-20mm-hex-Bases-12-p/lxt-s-12.htm
     
  2. LordHelmet

    LordHelmet Supporting Member

    Tony,
    I have an off the wall question, I'm not very tech savvy so bare with me.
    On my last trip to Lowes I saw that they have LED screw in bulbs like the ones by sunbrite. a screw in socket, heat sink fins and 3, 5 or 9 LED depending upon how bright you want it to be. Now the packaging says they are only 2700k, but they 9 LED light is only $60. Is it possible to order up some blue and white LED's and remove the yellow ones and have a nice semi DIY LED for around $100? or is this not possible?

    like I said, I was just thinking.
     
  3. Gomer

    Gomer Honorary Member

    TEchnically yes, but I wouldn't recommend it. If you are coming around $100 for a screw in modified, I'd just pay a little more and do it right for $119 http://www.nanotuners.com/product_info.php?cPath=74&products_id=623

    Likely the HD one uses inferior LEDs
     
  4. LordHelmet

    LordHelmet Supporting Member

    cool, thats all I wanted to know.
     
  5. yardartist

    yardartist Guest

    That's what I am looking for Tony, thanks. I need this project to have fewer and fewer barriers for my limited skill with electrical projects.
     
  6. sfsuphysics

    sfsuphysics Supporting Member

    And most likely inferior power sources, so you wouldn't get that CREE level of output.

    Also wouldn't surprised me if the LEDs are attached to a single circuit panel, so good luck getting those stars to hook up to that.
     
  7. sfsuphysics

    sfsuphysics Supporting Member

    Question: Is there any issue with these "adhesive pads" being too thick? The thing with thermal adhesive is you can use a flat surface (razor blade, etc) to put a micro amount on, but still have awesome thermal contact to pull heat away, I'd be a tad worried these pads would be too thick and as such "overclocking" your LEDs might be problematic. Or am I just worrying too much.
     
  8. GreshamH

    GreshamH Guest


    I'd buy it from the source, www.nanocustoms.com since they are in Cali (Thousand oaks)
    http://www.nanocustoms.com/index.php?cPath=30
     
  9. Gomer

    Gomer Honorary Member

    Mike, I wouldn't use the thermal pads at 1 amp, but I'd use them at 700 mA and lower (just a feeling)
     
  10. newhobby

    newhobby Guest

    I would think that the only problem with epoxy or tape is that if you change your mind in the future, like I did, you are most likely looking at breaking that star to take it off.
    In my case, since I used screws, I can easily pop it off and replace with different color now. :)
    My 2 cents
     
  11. Marc

    Marc Guest

    Is there an LED hitting close to 10,000k or maybe I should ask whats a good mix to get that color?
     
  12. sfsuphysics

    sfsuphysics Supporting Member

    Ok now that school is over I have some time to work again... ok not true I have a stack of papers to read through and grade, BUT I felt a bit like procrastinating (kind of like my students who wait until the last moment to do homework :p)....

    Anyways here's a sneak peak...



    Attached files /attachments/sites/default/files/LEDs.JPG
     
  13. Marc

    Marc Guest

    That looks like a car with MH on....sweet! more pics man!
     
  14. sfsuphysics

    sfsuphysics Supporting Member

    http://www.bareefers.org/home/node/10614

    This thread since it's less of a Q&A and more of a Look at what I did.
     
  15. sendo

    sendo Guest

    Hey Gomer,

    Wanted to get an update on your SPS growth under the LEDs. Are they still bleached/browning out? I have read that some of the easier sps, like green slimers, do well under LED. Curious to see how more demanding corals fair.
     
  16. Gomer

    Gomer Honorary Member

    dropped the light intensity in a few stages and the weren't bleached by the end, but they were brown. Corals that didn't bleach browned. Those that were colorful under the high light stage, stayed colorful under the lower light stage.

    green SPS did well. red did ok and blue did poor.
     
  17. sendo

    sendo Guest

    Do you think it is light shock, or something with the spectrum of LEDs?
     
  18. Gomer

    Gomer Honorary Member

    The bleaching was shock+ intensity, but that was only on certain corals. I had some SPS that were off to the sides. I had one that was in two locations (light intensities) and they never showed any signs of bleaching. Having run the LEDs for several months on SPS, I'm leaning towards spectrum.
     
  19. sendo

    sendo Guest

    I want to upgrade the lighting on my tank and was thinking of building an LED fixture like yours, but I guess I will have to stick with MH for now. The LEDs sure look bright enough to grow anything. I read somewhere that LEDs don't put off any UV, but no one knows if corals need UV or not.
     
  20. Gomer

    Gomer Honorary Member

    before you take my experience as the end all, I would check in with others and see what works and doesn't work for them :)
     

Share This Page