UVDI, of Valencia, Calif., is the North American technical resource center for Philips Lighting Co. The former company offers ultraviolet replacement lamps, quartz sleeves and ballasts for a variety of water disinfection systems. The lamps are manufactured using soft glass technology with less than 5 milligrams of mercury. As for performance, the lamps produce greater than 80 percent of original lamp intensity (end of life) as compared to less than 60 percent for hard glass lamps.