The high pressure sodium lights are fairly small and contain added element mercury. On first struck dark pink color glow is produced and once it gets more completely heated it gets to be pinkish orange. Some times in between a bluish while glow is also formed due to the mercury present inside when the sodium is not totally warmed.

The D line of sodium is responsible for the generation of light right from the lamp, which is extremely pressurized broadened by the high pressure of sodium. This broadened and mercury emission results in distinctive vision under the lamp. Thereby it can be utilized in areas wherever color rendering is a very critical factor. Accordingly sodium lamps are utilized by interior gardening gardeners as a result of wide array color temperature spectrum at significantly cheaper cost. Stemming from the excessive high chemical reactivity of the sodium arc inside the lamp it is excursively composed of Aluminum oxide covering to secure it from damage. A noble gas Xenon is inserted into the lamp which usually acts as a starter gas. It do not meddle with reactions taking place inside the lamp, and helps the lamp to get started at moderately lower potential however itself remains inactive and unchanged and therefore acts as catalyst.

Typically there are three modes of operation of high pressure sodium lamps:-

- Lamp is switched off, when virtually no current flows.
- Lamp is working when liquid amalgam is situated in the tube.
- Lamp is performing when the entire amalgam has evaporated.

The efficiency of sodium lamp is 50 to 140 lumen/watt that is certainly a lot more than mercury lamps. High pressure sodium light results in relatively very lower pollution as opposed to mercury vapor lamp. Hence high pressure sodium lights are not only more efficient and beneficial than other modes of light nonetheless are also eco friendly in nature. So, we should welcome this new invention with warm hands.

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