The LAMP-BCK-500W 120V SYLVANIA for Argus projector bulb is a high-quality and reliable lamp designed for use with the Roundabout 910 and 912 models. With a voltage of 120V, this universal compatibility lamp ensures a bright and clear projection for your slide and movie presentations. Known for its brand reputation and durability, SYLVANIA is a trusted choice for professionals in the field of film photography and projector maintenance.