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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 to entry: The poles of the (C, γ) coordinate system lie in this axis.
Note 2 to entry: The first axis is tilted when the attitude of the luminaire is changed from its attitude during measurement.
Note 3 to entry: See CIE 121
Note 4 to entry: This entry was numbered 17-436 in CIE S 017:2011.