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Light distribution curves, illumination diagrams and isolux diagrams · BEGA
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Calculation of the luminous intensity : Knowledge Base DIALux evo
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DIALux - Lighting technology: Beam spread Beam spread describes the directional characteristic of symmetrically radiating light sources, typically of reflector lamps, spots and floodlights. According to DIN 5040-4:1999-04 the beam spread [σ]