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Luminosity Conversion Question

  1. May 18, 2006 #1
    Could someone help me out with a conversion question.

    How do you convert 290mcd to candelas/meter square?
    Or what additional information do I need to make the converstion?

  2. jcsd
  3. May 18, 2006 #2
    If "mcd" means milicandela then a "conversion" between these two quantities is impossible. I think you have to compute the luminance E (in cd/m^2) at a given point on a surface from a source with a given luminous intensity I (in cd). If this is the case, the equation you need is
    [tex]E=\frac{I}{r^2}cos \alpha[/tex]
    with r the distance from the source to the point and \alpha the incidence angle (measured from the normal direction).
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