: A light failure monitoring system comprising: a switch (370, 410, 420, 540, 550); a first circuit coupled to a second circuit; the first circuit configured to provide an initial current to activate the switch (370, 410, 420, 540, 550) to an on state; the second circuit responsive to the switch and comprising a light source (320, 440), said switch, when on, is configured to allow a current to flow through the light source, thereby allowing the light source to emit light; characterized in that the light failure monitoring system further comprises: an alarm for indicating that the light source has failed, the alarm coupled to the first circuit and operationally coupled to the switch; and a light sensitive device (330, 450, 560) configured to detect light from the light source (320, 440); said light sensitive device (330, 450, 560) configured to supply a maintaining current to the switch (370, 410, 420, 540, 550), when the light sensitive device detects light emitted from the light source, the maintaining current replacing the initial current for continuing the switch (370, 410, 420, 540, 550) in the on state, wherein when the light sensitive device does not detect light, the maintaining current supplied by said light sensitive device (330, 450, 560) decreases and the switch (370, 410, 420, 540, 550) turns off, thereby causing the alarm to indicate that the light source has failed. a switch (370, 410, 420, 540, 550); a first circuit coupled to a second circuit; the first circuit configured to provide an initial current to activate the switch (370, 410, 420, 540, 550) to an on state; the second circuit responsive to the switch and comprising a light source (320, 440), said switch, when on, is configured to allow a current to flow through the light source, thereby allowing the light source to emit light; characterized in that the light failure monitoring system further comprises: an alarm for indicating that the light source has failed, the alarm coupled to the first circuit and operationally coupled to the switch; and a light sensitive device (330, 450, 560) configured to detect light from the light source (320, 440); said light sensitive device (330, 450, 560) configured to supply a maintaining current to the switch (370, 410, 420, 540, 550), when the light sensitive device detects light emitted from the light source, the maintaining current replacing the initial current for continuing the switch (370, 410, 420, 540, 550) in the on state, wherein when the light sensitive device does not detect light, the maintaining current supplied by said light sensitive device (330, 450, 560) decreases and the switch (370, 410, 420, 540, 550) turns off, thereby causing the alarm to indicate that the light source has failed. an alarm for indicating that the light source has failed, the alarm coupled to the first circuit and operationally coupled to the switch; and a light sensitive device (330, 450, 560) configured to detect light from the light source (320, 440); said light sensitive device (330, 450, 560) configured to supply a maintaining current to the switch (370, 410, 420, 540, 550), when the light sensitive device detects light emitted from the light source, the maintaining current replacing the initial current for continuing the switch (370, 410, 420, 540, 550) in the on state, wherein when the light sensitive device does not detect light, the maintaining current supplied by said light sensitive device (330, 450, 560) decreases and the switch (370, 410, 420, 540, 550) turns off, thereby causing the alarm to indicate that the light source has failed.