Brand: LSE Lighting - Professional Ultraviolet Lighting This UV bulb by LSE Lighting brand is 100% compatible replacement for Lennox UVC Air System which requires 91X61. All lamps listed are compatible (LSE Lighting brand) UV products. All Lennox brand names, trademarks and logos are property of Lennox. Warning: Ultraviolet Germicidal UVC light is harmful and dangerous to your eyes and skin. Please Use safety gear during installation.