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.).
Cal. Code Regs. Tit. 13, § 631
Note: Authority cited: Section 26103, Vehicle Code. Reference: Sections 24006 and 26103, Vehicle Code.