C, γ coordinate system

coordinate system commonly used in the photometry of luminaires in which the C-planes are half-planes that rotate round the vertical line through the photometric centre of the luminaire, and the γ-angles are measured up to 180° from the direction of the perpendicular to the rotation axis of the C-planes

NOTE Other coordinate systems (A, α) and (B, β) exist as well. See CIE 121-1996.

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