A white headlight and red rear reflector are required by law.
Additional lights and reflectors can be used as well.
Add lights and reflectors to outline your body and identify yourself as a person.
Lights and relectors that move (leg bands, pedal reflectors) catch a driver's attention.
SEE AND BE SEEN WHEN BICYCLING AT NIGHT
A bright white light on the front of your bike helps you see and be seen by others, and is required by law.
A red rear reflector is also required. Flashing red lights can be used as well.
A flashing light is better at getting the driver's attention, while a solid light makes it easier for drivers to judge your speed and distance.
Adding reflective leg bands, lights that move or flash and wearing a reflective vest or other clothing will help to identify you as a bicyclist to other drivers.
Your front light should also allow you to see the road far enough ahead to avoid a hazard. At 15mph, you should be able to see at least 35-50 feet in front of you, and even
farther under more adverse road or weather conditions.
You need lights on paths and sidewalks as well, so you can see and be seen by other bicyclist, pedestrians and cross traffic.