Luminosity Conversion Question

[alexa179]

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?

Thanks!

 

[clive]

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
$$E=\frac{I}{r^2}cos \alpha$$
with r the distance from the source to the point and \alpha the incidence angle (measured from the normal direction).

 

[sir-pinski]

To convert from millicandelas (mcd) to candelas/meter square, you would need to know the area over which the luminosity is being measured. This is because candelas/meter square is a measurement of luminous intensity per unit area. Once you have the area, you can use the formula:

Candelas/meter square = mcd / (area in square meters)

For example, if the area being measured is 1 square meter, the conversion would be:

Candelas/meter square = 290mcd / (1m^2) = 290 candelas/meter square

If you are unsure of the area, you may need to consult a measurement device or refer to the specifications of the light source in question. I hope this helps!