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Lighting Design Glossary

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Beam Axis

(Term of photometry)

The direction along the center of the solid angle (beam angle) within wich the luminous intensity of a luminaire is above a defined threshold (usually 50%). For projectors with lenses, the beam axis most often coincides with the optical axis.


   beam angle
luminous intensity
solid angle
English    German
beam axis    Der Hauptstrahl
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