The Mercury Vapor Light Fixture Replacement Sensor replaces old worn or damaged light sensors. Brink s replacement photocell s easy plug-in design is compatible with most outdoor area lighting sensors. The photocell allows the light fixtures to turn on at dusk and turn off at dawn automatically. Installation is quick and easy to provide illumination within minutes. Brinks is A Trusted Name in Security Since 1859™ Use with Brink s Dusk To Dawn Activated Security Light Model No. 7252.