US Patent 11085664 Light fixture sensors for external use

A light fixture can include a housing and a sensor coupled to the housing. The sensor of the light fixture can include a first port disposed in the occupiable volume of space, where the first port is configured to measure a first parameter in the occupiable volume of space. The sensor of the light fixture can also include a second port disposed in a plenum volume of space, where the second port is configured to measure the first parameter in the plenum volume of space. The sensor of the light fixture can further include a first transducer coupled to the first port and the second port, where the first transducer is configured to determine a first parameter differential between the first parameter measured by the first port and the first parameter measured by the second port.