Home / Science and Technology / How does High Pressure Sodium lamp works?

How does High Pressure Sodium lamp works?

How does High Pressure Sodium lamp works?

How does High Pressure Sodium lamp works?

How does High Pressure Sodium lamp works?High-pressure sodium lamps are quite efficient—about 100 lm/W—when measured for photopic lighting conditions. The higher power versions of 600 W have an efficiency of 150 lm/W. They have been widely used for outdoor area lighting such as streetlights and security. Understanding the change in human color vision sensitivity from photopic to mesopic and scotopic is essential for proper planning when designing lighting for roads.

Because of the extremely high chemical activity of the high-pressure sodium arc, the arc tube is typically made of translucent aluminum oxide. This construction led General Electric to use the tradename “Lucalox” for their line of high-pressure sodium lamps.

Xenon at a low pressure is used as a “starter gas” in the HPS lamp. It has the lowest thermal conductivity and lowest ionization potential of all the non-radioactive noble gases. As a noble gas, it does not interfere with the chemical reactions occurring in the operating lamp. The low thermal conductivity minimizes thermal losses in the lamp while in the operating state, and the low ionization potential causes the breakdown voltage of the gas to be relatively low in the cold state, which allows the lamp to be easily started.

Advertisements

 

“White” SON

A variation of the high-pressure sodium, the White SON, introduced in 1986, has a higher pressure than the typical HPS/SON lamp, producing a color temperature of around 2700 K, with a CRI of 85, greatly resembling the color of an incandescent light. These are often used indoors in cafes and restaurants to create a particular atmosphere. However, these lamps suffer from higher purchase cost, shorter life, and lower light efficiency.

About Electronics Help Care

Ramen Bairagee

Check Also

RAM ROM And Bits And Bytes

What are they? RAM ROM And Bits And Bytes RAM ROM And Bits And Bytes …

Leave a Reply

Your email address will not be published. Required fields are marked *