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Thread: White LED experiment

  1. #49
    Av8tor1's Avatar
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    Mobile,

    So far its pretty dang impressive. One thing I would do different would be get the 1000ma Buckpack driver. Since they have externally adjustable models in all three sizes (350ms/700ma/1000ma) there is really no reason not too. They are only a dollar or two difference in price. Even if you didn't use it, you would have the extra power there if you needed it. I don't think you could get by with passive cooling at 1000ma though. But you could probably get by with a low RPM/Low dB /Low Cfm fan. The light itself reminds me of the small halogens you see used in some of the nicer motel lifts... it does have "bling" and its a very nice "true" white light

    Still much to learn before I would say jump..... but very promising. I just wish they weren't still so expensive. However, for the application you're considering, it could be the ideal light. After the trials I'm going to use mine in a similar application. (combined with my peltier experiments)

  2. #50
    mobile's Avatar
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    For large scale plant illumination then they would be too expensive but for a feature plant light it doesn't work out too bad. Was thinking a nice small glass shelf for a single plant and a box shelf above to mount the LED and driver. Low speed fan would be fine, I hardly notice the one in my HD digital satellite receiver/HD recorder so I'm not likely to notice another one.

  3. #51
    Av8tor1's Avatar
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    I researched those the other day and went with the 120mm Scythe S-FLEX SFF21D, its only 8.7dB!!! and 800rpm IIRC, plus they are extremely reliable with the Sony mfg. liquid filled bearings, supposedly good for 150k hours of operation. They also have an excellent reputation.

    I dug around and found them for just over 11USD each, and with ordering 5 I got free shipping to boot!!
    (needed some for a rack upgrade too)

    Newegg review
    Last edited by Av8tor1; 06-13-2010 at 02:20 PM.

  4. #52
    Zero's Avatar
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    Av8tor1,
    Looks great so far!
    The gypsicola is producing much more dew/mucilage.
    My gypsicola turn a pinkish color with good light, so look for that.
    I'm very interested in this thread.
    Do you have any links that would give me some info on building something like this?
    Peace,
    Zero
    SK-8 OR DIE

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  5. #53
    Av8tor1's Avatar
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    Adam, give me a bit and Ill post exact links for ya...

    http://www.luxeonstar.com/ANSI-White...000-85-20t.htm

    http://www.luxeonstar.com/700mA-Ext-...23-d-e-700.htm

    http://www.luxeonstar.com/Carclo-22-...er-p/10511.htm

    http://www.dealextreme.com/details.dx/sku.4579

    The driver module can drive up to 7 Leds (2 tristars)... each Led needs about 3.2vdc, so your dc power supply must be 3 or 4vdc greater then the sum of the LED's you plan on driving. (you wire the led's in series)

    Example: I want to drive two tristars with one driver module
    (6x3.2)+4 = required power supply voltage (Basically a 24vdc supply for 2 tristars, 12vdc for a single)
    A generic regulated Apple laptop power supply on Ebay is 24vdc and about 12$
    The heatsink is a common PC processor heatsink, buy those anywhere on the cheap... few dollars

    The 5k pot and 220uf@35vdc capacitor is available at radio shack for a couple bucks..

    But Adam, I don't know if the optic angle I chose is the best yet, I don't know if 700ma is the best.... everything is still unknown for our application. Most work in LED's for plant use has to do with red and blue, these high quality/High power whites are still too new to have much info out there.

    But its fun learning.... and as mobile stated, for a small application the possibilities are awesome
    Last edited by Av8tor1; 06-13-2010 at 04:18 PM.

  6. #54
    RL7836's Avatar
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    Since intensity is so strongly correlated to distance (inverse square iirc), how far are you positioning the unit from the plant? (& how far was it from the T-5's?)
    All the best,
    Ron
    You must do the thing you think you cannot do. --- Eleanor Roosevelt

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  7. #55
    Av8tor1's Avatar
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    Ron

    Right now its about the same as it was with the t5...
    Its at the bottom of a 10gal aquarium with the led level with the top

    and I'm not so sure the inverse square law is as applicable in this application. For it to apply the area of the light beam has to double as the distance doubles, with concave/parabolic-ish type lenses/reflectors I'm not so sure this still applies.
    It comes down to the geometry of the area over which the power spreads out. Let's make it easy for ourselves, and assume the power spreads out equally in all directions, in which case the area is the surface of a sphere Therefore at a distance r from the source, the power P of the source passes through an area 4πr2 - the surface area of a sphere radius r.

    I = P/A = P/ 4πr2

    so I ∝ 1/r2 (∝ = proportional to)

    This is the inverse square part - square because the distance is squared, and inverse because intensity is proportional to one over distance squared.

    So maybe its more correct in this application to say the intensity is reduced to 1/4, not when the distance is doubled as much as when the diameter of the beam is doubled. The inverse square law assumes this relationship is linear. The beam spreads at the same rate the distance is increased. Which would not hold true in this application.

    ummm maybe, my brain hurts LOLOLOLOL
    Last edited by Av8tor1; 06-14-2010 at 10:02 AM. Reason: clarification: added the term "reflector"

  8. #56
    Carnivorous plant enthusiast vraev's Avatar
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    wow!! Fantastic mate. I might have to consider this route to increase lighting without changing temps too much.

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