Novel high pressure sodium lamp

The utility model belongs to discharge lamp relates to a high pressure sodium lamp. The utility model provides a high pressure sodium lamp, including outer tube and inner tube, the inner tube settingin the outer tube, line (1) is touched in the coating on the outer wall of inner tube, touch line (1) including two vertical metal coil (11) and one horizontal metal wire (12), one of them vertical metal coil (11) are connected to the one end of horizontal metal wire (12), and its other end passes another vertical metal coil (11) and prolongs to the tip of inner tube, inner tube tip parcel one deck metal skin (2), metal skin 2 is through metal wire 3 and adjacent end portion's niobium union coupling. The utility model provides a high pressure sodium lamp improves the cold junction temperatureand improves the colour rendering, makes the cold junction temperature remain stable simultaneously, and it just tends to stable to discharge, and luminous flux, operating voltage, operating current and the power of bulb also