first axis (of a luminaire when measured in the C, γ coordinate system)

vertical axis through the photometric centre of a luminaire when it is at its tilt during measurement

NOTE 1 The poles of the C, γ coordinate system lie in this axis.

NOTE 2 This axis is tilted when the luminaire is tilted from its tilt during measurement.

NOTE 3 See CIE 121-1996 for more information on the first axis of a luminaire.

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