Glowbulb

A glowbulb was a device of some sort, which could wink out when overloaded. When he was nearly shot down in battle due to the malfunctioning R2-series astromech droid on Wes Janson's X-wing starfighter, Luke Skywalker felt that he would have winked out like one of these if not for a warning from the Force.

Apperances

 * Shadows of the Empire novel