A hazard detector may include a light sensor that senses a brightness level in an ambient environment. The hazard detector can have a processing system that receives an indication of the brightness level in the ambient environment from the light sensor. The processing system may then determine whether illumination in the ambient environment has been dimmed. Responsive to the dimming, the processing system may access information representative of a status of one or more components of the hazard detector. An illumination state may then be selected from a plurality of illumination states based on the accessed information representative of the status of the one or more components of the hazard detector. A light may then be illuminated based on the selected illumination state.