Eventually there will come a time that you will be riding in the dawn, dusk, or dark. LOTOJA has a dawn start with a dusk finish. A Wednesday Night Ride in the fall can run late, leaving you out on your bike as the sun goes down. It is the law to have lights and reflectors. You may be teased for the extra weight on a regular ride, but make sure you have them safely tucked in your bag in case you get caught in the dark.
You are required to have a white headlight, red taillight or reflector, and side reflectors, all visible for at least 500 feet (41-6a-1114) any time you ride earlier than a half hour before sunrise, later than a half hour after sunset, or whenever it is otherwise difficult to make out vehicles 1000 feet away (41-6a-1603).