100% compatible replacement UV-C sanitizer bulb for ClearRay® systems using part number 6472-841. This replacement bulb is designed for use in Jacuzzi® Hot Tubs and Sundance® Spas equipped with the ClearRay® Water Purification System. Please note: Original part number 6472-857 has been discontinued by the manufacturer and superseded by updated replacement part number 6472-841. The newer design offers increased performance while remaining fully backward compatible with older ClearRay® systems. Also Known Part Numbers: 6472-857 UVL-LO10Ws 16046-L163 This high-output UV sanitizer bulb operates at germicidal wavelengths designed to help reduce bacteria, viruses, algae, mold, and other microorganisms commonly found in spa water. UV-C technology works by disrupting the DNA of microorganisms, rendering them unable to reproduce while helping maintain cleaner and clearer water without affecting water chemistry. The updated ClearRay® XL replacement bulb provides approximately 20% greater water contact and up to 40% higher UV output compared to the original 6472-857 design, while maintaining direct compatibility with existing systems. Features & Benefits: 100% compatible replacement for ClearRay® systems Replacement for discontinued part number 6472-857 Updated 6472-841 design with improved UV performance Helps maintain cleaner, clearer spa water Supports reduction of bacteria, mold, algae, and microorganisms Simple installation process Designed for Jacuzzi® Hot Tubs and Sundance® Spas Compatible with systems installed in 2012+ models Compatible With: Jacuzzi® J-200 Collection Jacuzzi® J-300 Collection Jacuzzi® J-400 Collection Jacuzzi® J-LX Collection All Sundance® Spas 2012+ equipped with ClearRay® systems Installation Notes: Power down the spa before servicing the UV system Avoid touching the bulb glass directly with bare hands Use latex or powder-free gloves during installation Quartz sleeves should be cleaned periodically for optimal UV performance Annual bulb replacement is recommended to maintain effective UV sanitation Technical Specifications: Part Number: 6472-841 Lamp Type: UV-C Sanitizer Bulb Application: Spa & Hot Tub Water Purification Technology: ClearRay® UV Sanitization Glass Type: Low Ozone / Germicidal UV-C Note: CureUV.com supplies high-quality replacement UV bulbs compatible with original equipment manufacturer systems.