Low Pressure Sodium Vapour Lamp complete with a High luminous efficacy leads to low energy consumption. This lamp is uniform sodium distribution in the discharge tube by means of dimples for a more stable discharge, higher efficacy and better lumen maintenance and lamp life, monochromatic yellow colour with non-existent colour rendering. It is suitable for road lighting, railway marshalling yards and crossings, airports, harbours and docks, quarries, foundries and rolling mills, Security and orientation lighting.