California Code, Vehicle Code - VEH § 25450

Any motor vehicle, other than a motorcycle, equipped with lighted acetylene headlamps complies with the provisions of this code concerning lighted headlamps when it has two lighted acetylene headlamps of approximately equal candlepower mounted upon the front of the motor vehicle and fitted with clear plane glass fronts and bright six-inch spherical mirrors and standard acetylene five-eighths or three-quarters foot burners, not more and not less, projecting sufficient light ahead to reveal any vehicle, person or substantial object upon the roadway within 200 feet.