Radiance/Irradiance - Maya

Hi,
Can someone please give me a basic (working) , non mathematical,
definition for radiance and irradiance? I have been using Wiki/Google
but it is difficult for me to tell when to use one term and when to
use the other. I need this for an artistic graphical application not
something scientific or mathematical.

Here is what I came up with:

Radiance - amount of light emitted from a surface
Irradiance - amount of light incident on a surface

Thanks,
Ron

.

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    ... Radiance - amount of light emitted from a surface ... Irradiance - amount of light incident on a surface ... It has units of W/, and not only tells you where the radiation is going, but how much is being emitted from an extended surface. ... The best book for all of this is William Wolfe's "Introduction to Radiometry" ...
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