Incandescent specialty A-shape light bulbs are perfect for general or creative lighting needs. To help you find the right bulb for the right application, see Westinghouse's full offering of specialty A-shape light bulbs including colored, bug light, tough shell, rough service, garage and Low voltage varieties. A-shape light bulbs are available with medium screw bases making them compatible for use with standard household fixtures everything from table lamps, garage door openers and work lights to porch lamps and outdoor lanterns.