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
Virginia requires headlight on the front emitting a white light visible in clear weather from at least 500 feet. For the rear, red rear reflector of a state-police-approved type, visible from 50 to 600 feet when directly in front of low-beam headlamps, **or** a red taillight visible from 500 feet in lieu of (or in addition to) the reflector. The rule applies whenever it is dark. See Va. Code § 46.2-1015.
The cheapest way to stay legal in Virginia 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.