American National Standards Institute or ANSI light bulbs are desiginated by a three-letter code such as FXL, ENX, BAB, etc. The code represents a specific type of lamp identified by its wattage, bulb shape, and beam characteristics. ANSI bulbs are found in specialty lighting applications where the bulb must meet a strict specification. We offer over 500 unique ANSI bulbs for applications ranging from ophthalmic to microscope. Our customer service representatives are very experienced in helping customers with ANSI bulb questions. Call us if you need assistance.