Abstract: The present invention provides a Control Module 15 for controlling a dual filament bulb, in particular aircraft reading lamps, so as to detect the failure of one filament and energize the other filament. The Control Module 15 also has provisions for detection of bulbs that have only one or no operable filament(s) by activating an indicator (Light Emitting Diode) or connection to a test switch that will command the Module to activate bulbs that have two operable filaments only. The Control Module 15 consists of a solid state circuit made up of triacs, resistors, capacitor, diodes and fuse all packaged in a small printed circuit board. Interface between the Module and dual filament bulb, indicator or test switch is easily accomplished by a small connector on the Control Module 15.