POWERFUL PERFORMANCE: This UVC light is designed to enhance water filtration systems in ponds, pools, and similar environments, improving water purification efficiency with a 99.9% effectiveness rate. Made with a high-transmission quartz tube and G23 base, it offers a long lifespan of up to 8,000 hours, providing a reliable and cost-effective solution for continuous operation. ENVIRONMENTALLY SAFE: Free from hazardous materials, this UV bulb supports clean water maintenance in ponds and filtration systems. Please follow proper disposal procedures at the end of its lifespan to minimize environmental impact and promote sustainability. Handle with care to avoid UV radiation exposure. EASY TO INSTALL: Always turn off power before installing or replacing the UV bulb to prevent electrical hazards. Insert the bulb into the designated socket following correct installation practices to ensure the integrity of the UV tube. Compatible with inductive ballasts only; not suitable for use with electronic ballasts. VERSATILE USE: Designed for practicality and adaptability, this UV lamp is easy to install and transport. Specifically engineered for lighting systems with G23 base, 13W lamps, and inductive ballasts, ensuring optimal functionality in compatible units. BROAD COMPATIBILITY: Works effectively with various pond and fountain filters, including multiple GPH-rated pond filters requiring a 13-watt UV lamp, delivering consistent water purification performance. Color: As Shown Material: Glass Package Contents: 2 x 13W UV-C Replacement Bulb Note: Light reflection and display differences may cause slight variations between the product color in images and the actual item. Measurement may vary by +/- 1-3 cm.