A sensor module is integrated into a lighting fixture. The sensor module includes one or more environmental sensors and can be readily installed in or removed from the lighting fixture. In one embodiment, a heatsink of the lighting fixture is configured to receive the sensor module. Readings from the environmental sensors may be passed to control electronics associated with the lighting fixture and used to control the light output of the lighting fixture. The readings may also be passed on to other lighting fixtures, which may also use the readings to control their light output.