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Thread: White LED experiment

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    Av8tor1's Avatar
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    White LED experiment

    The luxeon tri-stars in 85CRI white are suppose to start shipping in June. A few of us have been talking about these for months, now the time has come. So Ive taken the plunge and preordered a couple to experiment with.


    Excellent spectral performance IMHO

    Still too expensive to build a rack's worth, but cheap enough for some fun experimentation
    Finally an LED that no one would know was an LED unless you told them.
    Av

    ---------- Post added at 10:57 PM ---------- Previous post was at 10:38 PM ----------

    http://www.luxeonstar.com/ANSI-White...000-85-20t.htm
    Last edited by Av8tor1; 05-17-2010 at 07:53 PM.

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    How are the lumens compared to some of the Cree (or other current) LEDs?
    All the best,
    Ron
    You must do the thing you think you cannot do. --- Eleanor Roosevelt

    *** Growlist / Wants / Offers ***
    (with Pics)

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    Av8tor1's Avatar
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    Its hard to compare their data, but the luxeon appears to be about 10% higher.. and these are ANSI rated, whereas Crees are not as far as I can tell. It's a Ford-Chevy thing.... Im sure Cree wont be far behind.

    Of course this is only one component, you still need the driver and an auxiliary lens. As are their optical angle is about 120 degree (both luxeon and Cree) which is way too wide for our application

    Each tri-star will driven at 700ma (with proper heatsinking) and should be 9 watts +/- with a very small footprint (20mm) and Ive ordered 22 degree axillary lenses so the luminance should be extremely high

    Max current is 1000ma, so I could go up if needed

    Calculated lumens @700ma will be 450ish each, Luxeon does have a higher lumen model but at cost of much lower CRI (70)

    The big advantage of the luxeon is the 85CRI compared to the 70CRI of the equivalent Cree model.
    Last edited by Av8tor1; 05-19-2010 at 08:33 AM.

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    I look forward to seeing your results. I too am ordering a tristar of these to do some experiments, along with some coloured leds.

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    It's a shame that the peak in the green wavelength isn't shifted slightly more to the red end of the spectrum, then they might have made good grow lights.

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    Av8tor1,
    What plant are you going to experiment on?
    The luxeon LED's are REALLY bright.
    SK-8 OR DIE

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    I like how you customize you own 3 LEDs. Personally I'd like to see what the results would be putting a 6500K, 627nm and 447nm on one of those tri-star base.
    They look funky though, how in the world do you hook one of these up and mount it??

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    Av8tor1's Avatar
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    Quote Originally Posted by mobile View Post
    It's a shame that the peak in the green wavelength isn't shifted slightly more to the red end of the spectrum, then they might have made good grow lights.
    Mobile,

    I think they have the potential of doing very well...
    Here is the spectra of the lamps Ive used for the last few years with what I think is decent performance

    Narva 5000k 85CRI
    (measured with my own spectrometer)
    Compared to these the green is shifted quite a bit to the red I think

    Zero, ummm dont know yet.... but I did get a dimmable driver module so I can adjust the intensity based upon the plant's need.

    Z... yes, Im anxious to follow your results as well.... If you dont mind me asking what driver current and aux optic angle did you decide on?
    I went with the externally dimmable 700ma and 22 degree lens as a starting point

    Av

    ---------- Post added at 10:37 AM ---------- Previous post was at 10:19 AM ----------

    Quote Originally Posted by F R e N c H 3 z View Post
    I like how you customize you own 3 LEDs. Personally I'd like to see what the results would be putting a 6500K, 627nm and 447nm on one of those tri-star base.
    They look funky though, how in the world do you hook one of these up and mount it??
    Yann,

    You have to mount these to a heat sink, even at 350ma the rule of thumb is one square inch of heat sink per watt (bare minimum)

    Thermal runaway and spectral shift is a real issue with heat build up

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