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For road cycling you must have a front white light and a red rear reflector in most states. Most motorists understand that a white light is something moving toward them while the red is moving away—this only works, however, if the lights are visible.
*Inexpensive bike lights seldom light up enough of the path for you to see, let alone motorists to see you from a distance. If you're going to be doing a lot of night riding, it's best to go beyond the minimum for your money.