What is high pressure sodium lamps?
High-pressure sodium (HPS) lamps are part of the family of high intensity light bulbs that put out large amounts of light generally needed for street lighting and security lighting. The combination of metals and gasses within inside the glass tube produces an orange-white light commonly found in street lights.
What are high pressure lamps?
High pressure sodium (HPS) lamps are the most efficient member of the HID family where some degree of color rendition is important. Standard HPS lamps produce a golden white light when they reach full brightness. Many recognize them as the familiar golden light from street lights, one of their principal applications.
How does high pressure sodium lamp work?
In a high pressure sodium lamp, a compact arc tube contains a mixture of xenon, sodium and mercury. The xenon gas which is easily ionized, facilitates striking the arc when voltage is applied across the electrodes. The heat generated by the arc then vaporizes the mercury and sodium.
What is low pressure sodium lamp?
A low-pressure sodium lamp is a type of lamp that produces light from sodium gas contained in a bulb operating at a partial pressure of 0.13 to 1.3 pascal. Low-pressure sodium lamps provide energy-efficient outdoor lighting compared to high-intensity discharge lighting, but they have a very low color rendition index.
What does LPS and HPS stands for?
There are two kinds of sodium lights: Low Pressure (LPS) and High Pressure (HPS). These lamps are mostly used for street lighting as well as industrial uses. The lamp works by creating an electric arc through vaporized sodium metal. Other materials and gases are used to help start the lamp or control its color.
What are sodium lights used for?
High-pressure sodium (HPS) lamps have been widely used in industrial lighting, especially in large manufacturing facilities, and are commonly used as plant grow lights. They contain mercury. They have also been widely used for outdoor area lighting, such as on roadways, parking lots, and security areas.
Where are low pressure sodium lamps used?
Low pressure sodium lamps are used in outdoor lighting of some parking areas and bridge underpasses. The very yellow color does not attract insects but it distorts colors. While these lamps are highly energy-efficient they are rarely used because all objects under their light appear to be yellow or yellow-gray.
What is the difference between HPS and LPS lamps?
The high-pressure lights produce a more desirable golden to white light, while the color produced by low-pressure lights is yellow to orange. High-pressure sodium lights are more popular than low-pressure lights because of this significant color difference.
Where are high pressure sodium lamps used?
High pressure sodium lamps are used in outdoor lighting of streets and parking lots and in indoor settings where color rendering is not critical. These indoor settings include warehouse and shipping areas and some manufacturing areas.
