text: Here are excerpts from the California Vehicle Code (VC) relating to your question: \n\nd) Every bicycle operated upon any highway during darkness shall be equipped with the following:\n\n   1. A lamp emitting a white light which illuminates the highway and is visible from a distance of 300 feet to the front and the sides of the bicycle. \n\n   2. A red reflector mounted on the rear of the bicycle and visible from 500 feet to the rear of the bicycle. \n   \n   3. A white or yellow reflector mounted on each pedal visible 200 feet to the front and rear of the bicycle and a white or red reflector on each side to the rear of the center of the bicycle, except bicycles which are equipped with reflectorized tires on the front and the rear need not be equipped with side reflectors. All reflectorized tires must meet DMV requirements. \n\ne) 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 place of a lamp attached to the bike.\n\nI've seen some cyclists with lights attached to their helmets. I think that would be better than one attached to the handlebars. You can also get the red lights for the back. Mine has different blinking settings. I didn't attach mine to the bike but clip it on my jersey or belt bag when it gets dark.\n\nGood luck and ride safe with a helmet!