This guide is for general information only and is not legal advice. Laws change — verify current rules with your state DOT or a licensed attorney before relying on this for any legal matter. Read full disclaimer.
The rule
Maryland requires lamp on the front emitting a white light visible from at least 500 feet to the front, required from a half hour after sunset until a half hour before sunrise. For the rear, red reflector on the rear visible from all distances from 600 feet to 100 feet when directly in front of lawful lower-beam headlamps, or a red rear lamp visible from 600 feet in lieu of the reflector. The rule applies whenever it is dark. See Md. Transp. § 21-1207 (Riding on sidewalks; equipment).
The cheapest way to stay legal in Maryland is a USB-rechargeable front white light and a rear red light or reflector that meets the spec above. A $30 light set covers it.