California Code of Regulations
Title 13 - Motor Vehicles
Division 2 - Department of the California Highway Patrol
Chapter 2 - Lighting Equipment
Article 2 - Identification Markings
Section 634 - Sealed Optical Unit Markings

Sealed and semisealed optical units shall be marked on the lens with the manufacturer's name, initials, or lettered trademark and model number. Such units for driving lamps, fog lamps, and passing lamps may have the model number marked on the lens, or indelibly inked or permanently molded on the back of the unit. The model designation of a sealed warning lamp optical unit not covered by a lens or filter shall be indelibly imprinted or molded on the lens so as to be visible and legible when the device is installed.

Note: Authority cited: Section 26103, Vehicle Code. Reference: Sections 24006 and 26103, Vehicle Code.