http://www.leginfo.ca.gov/cgi-bin/di...le=21200-21212
21201.<edited for length>
(d) Every bicycle operated upon any highway during darkness shall
be equipped (1) with a lamp emitting a white light which, while the
bicycle is in motion, illuminates the highway in front of the
bicyclist and is visible from a distance of 300 feet in front and
from the sides of the bicycle; (
2) with a red reflector on the rear
which shall be visible from a distance of 500 feet to the rear when
directly in front of lawful upper beams of headlamps on a motor
vehicle; (3) with a white or yellow reflector on each pedal visible
from the front and rear of the bicycle from a distance of 200 feet;
and (4) with a white or yellow reflector on each side forward of the
center of the bicycle, and with a white or red reflector on each side
to the rear of the center of the bicycle, except that bicycles which
are equipped with reflectorized tires on the front and the rear need
not be equipped with these side reflectors. Such reflectors and
reflectorized tires shall be of a type meeting requirements
established by the department.
(e) A lamp or lamp combination, emitting a white light, attached
to the operator and visible from a distance of 300 feet in front and
from the sides of the bicycle, may be used in lieu of the lamp
required by clause (1) of subdivision (d).