A sensor support for use with a lighting refractor includes a housing defining an interior cavity configured to receive and support a sensor for sensing at least one of motion or light. The sensor support further includes a locking structure operatively associated with the housing and configured to selectively attach the housing to a peripheral portion of a lighting refractor, and an aperture in the housing and arranged to expose the sensor to an environment around the lighting refractor. Sensor and lighting unit assemblies are also disclosed. A sensor assembly includes the sensor support and a sensor configured to sense at least one of motion or light. A lighting unit assembly includes the sensor support and a lighting unit having a refractor with a peripheral portion.