High Pressure Sodium

High Pressure Sodium

35 Watt

35 Watt High Pressure Sodium Ballast

50 Watt

50 Watt High Pressure Sodium Ballast

70 Watt

70 Watt High Pressure Sodium Ballast

100 Watt

100 Watt High Pressure Sodium Ballast

150 Watt

150 Watt High Pressure Sodium Ballast

200 Watt

200 Watt High Pressure Sodium Ballast

250 Watt

250 Watt High Pressure Sodium Ballast

400 Watt

400 Watt High Pressure Sodium Ballast

600 Watt

600 Watt High Pressure Sodium Ballast

1000 Watt

1000 Watt High Pressure Sodium Ballast A sodium-vapor lamp is a&n

Because they are second only to low pressure sodium as the most efficient and longest lasting of all HID lighting sources, HPS lamps are used in streetlights, parking lot lights and other outdoor lighting fixtures more than any other HID light source.  In these applications, a ballast failure isn't just an inconvenience, it's a public safety hazard.  That's why we at lighting-spot.com only carry the best major name brand ballasts from Universal Lighting, Advance, General Electric and more.  

sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm.

There are two varieties of such lamps: low pressure and high pressure. Low-pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting such as street lamps.[1] High-pressure sodium lamps produce a broader spectrum of light than the low-pressure lamps, but they still have poorer color rendering than other types of lamps.[2] Low-pressure sodium lamps only give monochromatic yellow light and so inhibit color vision at night.

High-pressure sodium

High-pressure sodium lamps (sometimes called HPS lights) 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. Understanding the change in human color vision sensitivity from photopic to mesopic and scotopic is essential for proper planning when designing lighting for roadways.[8]

High-pressure sodium lamps are quite efficient — about 100 lumens per watt, when measured for photopic lighting conditions. Some higher-power lamps (e.g. 600 watt) have efficiencies of about 150 lumens per watt.

Since the high-pressure sodium arc is extremely chemically reactive, the arc tube is typically made of translucent aluminum oxide. This construction led the General Electric Company to use the tradename "Lucalox" for its 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 stable 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.