Movement of a sealed optical unit in its housing shall not exceed ± 5 deg rotation, measured about the axis of the unit from a vertical line passing through the top of the unit. Lamps with lenses that are not located in a firmly fixed position in the housing shall comply with the photometric requirements with the lens in any position to which it can be shifted.
Cal. Code Regs. Tit. 13, § 646
Note: Authority cited: Section 26103, Vehicle Code. Reference: Sections 24012 and 26103, Vehicle Code.