Article 2. Lighting Equipment of California Vehicle Code >> Division 16.5. >> Chapter 6. >> Article 2.

When operated from one-half hour after sunset to one-half hour before sunrise, each motor vehicle shall be equipped with at least one lighted white headlamp directed toward the front of the vehicle. Such lamp shall be of an intensity sufficient to reveal persons and vehicles at a distance of at least 200 feet.

When operated from one-half hour after sunset to one-half hour before sunrise, each motor vehicle which is not in combination with any other vehicle shall be equipped with at least one lighted red taillamp which shall be clearly visible from the rear.
  (a) Every such vehicle or vehicles at the end of a combination of vehicles shall be equipped with one lighted red taillamp when operated from one-half hour after sunset to one-half hour before sunrise.

A person shall not display a flashing or steady burning red or blue warning light on an off-highway motor vehicle except as permitted by Section 21055 or when an extreme hazard exists.