Abstract: A lightable corner guard available for attachment to the protruding corner edge of two adjoining walls. The corner guard utilizes a flexible cover to protect occupants and objects that impact the corner edge. In a preferred embodiment, the corner guard utilizes a microphone amplifying control circuit that is activated upon the receipt of sound from a conventional smoke alarm. The control circuit directing battery voltage to a step-up transformer which in turn energizing flash tubes for illuminating the corner guard and surrounding area. The control circuit includes an oscillator for strobing the flash tubes and a sleep cycle to conserve battery power.