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M E A S U R I N G   L I G H T   (continued)

5. PHOTOMETRIC MEASUREMENTS  (continued)


5.2 Photometry At Light Emitting Plane
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5.2.1 Luminous Exitance  M
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Key words:
FLUX PER AREA | EXITANCE | LUMINOUS EMITTANCE


Definition, unit, other names:

This photometric quantity again is very closely related to its radiometric counterpart, the radiant EXITANCE; see para. 4.2.1.

Accordingly, luminous EXITANCE  M  is the total emitted (here: luminous) FLUX PER AREA:

        M = (Phi) / A1

"Total" again means "emitted into all directions of space". And Area  A1  is the emitting area.

Regarding "other names", you should know that "EXITANCE" and "LUMINOUS EMITTANCE" both are the very same quantity like luminous EXITANCE  M .


measurement procedures:

In para. 4.2.1 you'll also find text and figures about measurement procedures for homgeneous and for structured sources as well as some thoughts about measuring EXITANCE  M  with a pixelized camera.

The differences between radiant EXITANCE  Me  and luminous EXITANCE  Mv  are described in para. 4.0 and especially in para. 5.0


Continued: 5.2.2 Luminous Intensity I

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