High Pressure Sodium Vapour Lamps are available with a polycrystalline translucent aluminium oxide discharge tube enclosed in an ovoid or tubular outer glass envelope. These Sodium Vapour Lamps need a control gear comprising of ballast and capacitor for good performance. These Sodium Vapour Lamps are designed with golden white light that gives a warm appearance and better visual acuity. High Pressure Sodium Vapour Lamps find applications in highway streets, flyovers, junctions etc.
Applications of High Pressure Sodium Vapour Lamps: