2 rules for unincorporated Prince William County, Virginia.
Verified from official government sources
Prince William County's Zoning Ordinance sets outdoor-lighting standards (§ 32-250.200 series) requiring full cut-off fixtures that direct light downward to reduce glare and skyglow. A full cut-off fixture emits zero light at or above 90 degrees from horizontal.
PWC Zoning Ordinance § 32-250.202 / Part 100 Definitions
A "full cut-off" lighting fixture is one from which zero percent of its light output is emitted at or above 90 degrees from horizontal and no more than ten percent above 80 degrees from the horizontal.
Prince William County measures outdoor light in foot-candles under its Chapter 32 lighting standards (§ 32-250.202) and Subdivisions Code § 25-30. Site and subdivision lighting must be shielded and limited so glare and spillover onto neighboring residential property are controlled.
PWC Zoning Ordinance § 32-250.202 / Part 100 Definitions
Foot-candles are a quantitative unit of measure used to measure the brightness of light falling on a surface. One foot-candle is equal to the amount of light falling on a surface of one foot square from a standard candle located one foot away, and measurements shall be made with a photometric light meter at grade.
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