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Lumens per Watt?

Discussion in 'Beginner Electronics' started by JoeSP, Apr 6, 2006.

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  1. JoeSP

    JoeSP Guest

  2. default

    default Guest

    Check out some Cree X 7090 lamps if your application is general
    lighting. White output is 45 lumens with a 100 degree beam spread to
    the half power points. White is PN LED-110 $11.50 each

    I put four of the reds ($8 each) in my bike's tail/brake light and it
    is easily twice as bright as two incandescent 1147 lamps, at 1/3 the
    power. The reds are only 34 lumen output.

    They require a heatsink for continuous output.
  3. JoeSP

    JoeSP Guest

    If you mean lumens per watt, that would make these LEDs very inefficient. A
    rating of 10-20 lumens per watt is common for incandescent lamps and they
    are not considered efficient. Fluorescents are often rated 50-100 lumens
    per watt.

    I had heard that most white LEDs are not yet more efficient than
    incandescents, but some are being developed with increased efficiency. I was
    wondering if these were some of those.
  4. JoeSP

    JoeSP Guest

    Which is pretty great for a white LED. Finally an answer from someone who
    knows what they're talking about.
  5. GeekBoy

    GeekBoy Guest

    Why are you too stpid to figure it out yoruself? What an idiot
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