The immersion lamp consists of a UV low pressure lamp together with a starter, sealed into a water-tight protective quartz tube and fitted with a waterproofed lead.
              The lamps may be used directly in the water in eithe a vertical or horizontal position. The effective penetration depth of the UVC radiation in clear water is 30 to 50 cm. Depending on the length of the immersion lamp, a cylindrical volume of 60 to 100 cm diameter and 20 to 80 cm length can be disinfected in a few minutes