Lightbest's 240W single-ended, 5-pin stepped base amalgam lamps are perfect replacement for the DB 300H-4 and are suitable for UDV water disinfection systems. Made from high-quality quartz containing less than 1 ppm hydroxy (-OH) and advanced amalgam tech. & coating tech., our lamps perform with high UV intensity maintenance rate and offer lamp life up to 16000h. They are widely used in both new installation and replacement in water treatment UV system, offering reliable quality, stable performance, and an excellent value. Lightbest also offers door-to-door delivery services from our factory to global customers based on DDU or DDP term. CE, FCC, EPA, and MSDS certifications and documentation are also available to your need.