Cutoff Angle (Lighting)
Definition: With regard to an outdoor lighting luminaire, the angle between the vertical axis and the first line of sight at which the bare light source is not visible.
Related Links
What are the IESNA cutoff classifications? | Light Pollution | Lighting Answers | NLPIP
ERCO – Glossary – A – Cut-off angle
cut-off angle (of a luminaire) | IES
Light Conservation
Nighttime Friendly | Lithonia Lighting
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