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Need some help on LED brightness

Discussion in 'LEDs and Optoelectronics' started by mikezap99, Feb 27, 2010.

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  1. mikezap99


    Feb 27, 2010
    Hi everyone,

    I'm planning on installing LED lights in the interior of my car. I've read about the legality, and it seems that green lights are legal on the interior.

    I have found suppliers that offer a 23,000 mcd LED with a viewing angle of 15 degrees.
    I want something that will produce a bright glow, as the light bars will be hidden from direct view. There will be an LED every 1/2" of the light bars. None of the commercial light bar manufacturers are able to supply me with either a lumen rating or a candela rating, so I have nothing to compare this with.

    I have little experience with lighting but a fair amount of experience with circuits and the like.

    Is 23,000 millicandela bright enough for my application?
  2. Mitchekj


    Jan 24, 2010
    The viewing angle is what's disconcerting. 23000 mcd is fairly bright for these types of LEDs, but at 15 degrees, you're only talking about 1 to 2 lumens, and that's not incredibly bright by any standard. Any luck finding similar mcd ratings at a 30+ degree viewing angle?

    Manufacturers sure do love the specmanship, don't they? :) I'm surprised no one's come out with a 1,000,000 mcd LED yet (oh, and a 0.01 degree viewing angle, but meh.)
  3. mikezap99


    Feb 27, 2010
  4. mikezap99


    Feb 27, 2010
  5. Resqueline


    Jul 31, 2009
    When it comes to LED's and their application their spec don't tell it all and you'll either need experience or experiments. Iow. you're pretty much forced to get samples and try it out before deciding on a bulk buy. In this case it could seem that light distribution and scattering is a challenge, but being hidden from direct view it depends on a lot around the light bar itself. Sanding the surface of the LED's for instance is one way of diffusing the light if it turns out to be "spotty", but it may lower the apparent brightness a little.
    You can use trigonometry to calculate the approximate lumen output of potential candidates, or you can visit this forum where some members have actually measured up many types and presented their real & useful data (lumens, color, beamspread, appearance, longevity).
  6. neon


    Oct 21, 2006
    JUST SO you know 250,000 mcd is not uncommon i bought some and used them it is very hard to look at them directly I use them behind a water fountain water globe so the light is dispersed by the spinning globe it has a good effect.
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