ANSI - American National Standards Institute ANSI (American National Standards Institute) coded light bulbs meet specific industry standards for light output, bulb shape, base type, beam spread and other lamp specifications. If a manufacturer offers a light bulb with an ANSI designation, that bulb should be identical to a similarly ANSI designated bulb from other manufacturers. In the list below, some ANSI codes are followed by /5 or /7 or /130. This suffix indicates a version of the same bulb that is designed to provide longer rated life at some reduction in light output.