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]
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![depicts the light distribution of beam angle. light distribution curve... | Download Scientific Diagram depicts the light distribution of beam angle. light distribution curve... | Download Scientific Diagram](https://www.researchgate.net/publication/343872937/figure/fig13/AS:928596214427665@1598405998973/depicts-the-light-distribution-of-beam-angle-light-distribution-curve-from-the.jpg)