Bulbs with a mean spherical candela rating shall be operated at mean spherical candela for photometric tests. Bulbs and sealed units rated in watts shall be operated at design voltage for the photometric tests. Lamps designed for use in both 6-V and 12-V systems shall be tested with 12-V bulbs. Lamps designed for 24-V systems shall be tested with 24-V bulbs.
Cal. Code Regs. Tit. 13, § 653
Note: Authority cited: Section 26103, Vehicle Code. Reference: Sections 24012 and 26103, Vehicle Code.