a similar process can be performed when the leds 20 are in an u201c on u201d state as is described below with reference to fig3 in step s 6 the controller 22 analyzes the audio input signal u03b1 and the image signal u03b3 for example the controller 22 can analyze the audio input signal u03b1 to determine whether a sound over a predetermined volume is produced whether a spike in sound to a predetermined level greater than a level of normal background noise is produced whether a series of sounds at similar frequency to footsteps are produced whether a sound corresponding to human speech is produced or whether some other sound indicative of the presence of a person is produced similarly the controller 22 can analyze the image signal u03b3 by performing a facial recognition analysis comparing successive images of video to detect a moving object or performing another analysis in step s 7 the controller 22 determines whether a person is present based on the analysis of step s 6 alternatively the controller 22 can analyze the audio input signal u03b1 and the image signal u03b3 for the presence of something other than a person such as a fire if the camera.