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 631 - Size of Markings

Required markings and at least one letter of a lettered trademark shall be not less than 3.0 mm (0.12 in.) in height. Raised molded markings not less than 2.0 mm (0.08 in.) in height may be used on lenses with an area of less than 13 cm2 (2 in.2) or on housings with a projected area less than 25 cm2 (4 in.2). Indelible ink markings not less than 2.0 mm (0.08 in.) in height may be used on bulbs with a base diameter of less than 10.0 mm (0.40 in.).

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