HIGH-PRESSURE SODIUM: These lamps combine an efficiency brought up with impressive performances of longevity. Lamps high-pressure sodium offer important advantages in environment. The use of two tubes with bow increases the life cycle and reduces the probability of premature failures.
LOW-PRESSURE SODIUM: Although they are always used for numerous applications, these lamps are more and more replaced by lamps high-pressure sodium and metallic iodides. The restoration and the depiction of colors are weak but the brilliant efficiency is extremely important.