A High-Intensity Discharge lamp which includes a high intensity discharge light
disposed within the light cavity and a standby lighting control system including
a light sensor for detecting a light intensity within the light cavity and a standby
lamp which is supported within the lamp housing and is activated by the light sensor
between a standby mode and a backup mode, wherein at the standby mode, when the
light intensity of the high intensity discharge light within the light cavity is
above a predetermined threshold, the standby lamp is deactivated, and at the backup
mode, when the light intensity of the high intensity discharge light within the
light cavity is dropped below the threshold, the standby lamp is activated for
generating a backup light to compensate a loss of the light intensity of the high
intensity discharge light.