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Thread: 9 Watt Cree High-Efficiency Light

  1. #1
    Flashaholic
    Join Date
    Dec 2002
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    Dallas, TX
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    313

    Default 9 Watt Cree High-Efficiency Light

    It may be ugly....., but it is very efficient.

    9 Watts on my wattmeter. Three Cree Q2's running @ 700 ma.

    95% efficient switching power supply.



    Easily outperforms Compact Fl. of twice the wattage in down-throw applications.

    Color still in the 6000° K range.

    Now back to design on my 7 Cree Q5 AC light.

    Larry Cobb
    Last edited by LEDite; 08-08-2007 at 10:14 PM.
    UV Lights, Panasonic 3400mah #18650 cells available

  2. #2

    Default Re: 9 Watt Cree High-Efficiency Light

    Hi, what is this power supply ? Thanks

  3. #3
    Flashaholic
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    Default Re: 9 Watt Cree High-Efficiency Light

    DSE;

    The switching power supply is one of about 20 I tested for efficiency at at 8.5 watts output power.

    It was a 12 watt max design.

    Larry
    UV Lights, Panasonic 3400mah #18650 cells available

  4. #4

    Default Re: 9 Watt Cree High-Efficiency Light

    Ledite, where are you found this power supply ? Thanks

  5. #5

    Default Re: 9 Watt Cree High-Efficiency Light

    It is unusually ugly, yet, somehow... it's beautiful too. Any idea how many lumens you get out of those nine watts? Is that radiator big enough? Do you know how hot it runs?

    /trudges back to plain old stock CFL's...

  6. #6
    Unenlightened
    Join Date
    Jul 2007
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    Earth > Central Europe > Czech Republic
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    Default Re: 9 Watt Cree High-Efficiency Light

    Any schematic of used power supply? Or where you get it from?

  7. #7
    Flashaholic
    Join Date
    Dec 2002
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    Default Re: 9 Watt Cree High-Efficiency Light

    The power supply is a Chinese plug-in supply by Leader Electronics.

    It tested as the most efficient @ 11 volts and 700ma.

    I would estimate lumens @ 500. After 1 watt for PS, overall efficiency of 56 lumen/watt.

    Temperature stabilizes at 175° F (80°C).

    Larry
    Last edited by LEDite; 08-10-2007 at 09:17 PM.
    UV Lights, Panasonic 3400mah #18650 cells available

  8. #8
    Flashaholic
    Join Date
    Nov 2005
    Location
    Spain
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    223

    Default Re: 9 Watt Cree High-Efficiency Light

    Im doing some maths, and something dont match. Each Cree at 700mA consume about 2,5w, three leds sum 7,5w. Up to 9w, rest 1,5w. 1,5/7.5=20% losses at the driver. Far from 95% efficiency.

    The temperature cited, its of the heatsink?

    Anyway, good work

  9. #9
    Flashaholic
    Join Date
    Dec 2002
    Location
    Dallas, TX
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    313

    Default Re: 9 Watt Cree High-Efficiency Light

    Kinnza;

    The 95% efficiency was for the electronic switching power supply only.

    The Cree's actually are running over 700 ma. I figured ~ 8 watts for the LED's.

    The temperature was measured at the top surface of the LED's.

    Larry
    Last edited by LEDite; 08-11-2007 at 08:55 AM.
    UV Lights, Panasonic 3400mah #18650 cells available

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