California Code of Regulations
Title 13 - Motor Vehicles
Division 2 - Department of the California Highway Patrol
Chapter 2 - Lighting Equipment
Article 9 - Auxiliary Driving, Fog, and Passing Lamps
Section 711 - Mechanical Test Requirements

(a) Housings for Sealed or Semisealed Optical Units. Housings for sealed or semisealed optical units shall comply with the following tests described in Article 5 of this subchapter when an optical unit of the type for which the housing is designed is installed in the device:

Aiming adjustment

Corrosion

Lens recession

Vibration

Warpage (when plastic housings are used)

(b) Complete Assemblies. Assemblies consisting of a housing with a nonsealed unit or separable bulb, lens, or reflector shall comply with the following tests described in Article 5 of this subchapter:

Aiming adjustment

Corrosion

Dust

Lens recession

Moisture

Vibration

Warpage (when plastic lenses or housings are used)

(c) Sealed or Semisealed Optical Units. Sealed or semisealed optical units shall comply with the following tests described in Article 5 of this subchapter:

Corrosion (when metal reflector backs or replaceable bulbs are used)

Vibration (when filament shields or replaceable bulbs are used)

Warpage (when plastic lenses or reflectors are used)