What are high -pressure sodium lamps?

high density drain lamps are those that have compact arc tubes that contain gases and metal salts. They work at high pressures and temperatures. This category includes high -pressure sodium lamps. Their arc tubes contain sodium and metal salt is usually mercury. The gas present is usually xenon, which is used to start the lamp. It acts using a mixture of gas and sodium as a conductor. The electric current then evaporates the conductor and causes light.

One challenge in the production of these lamps is to find a material that sodium does not corrode. Aluminum oxide is a modern solution to this problem. This material, which is used for the arch tube, often appears to be milky white, but in fact it is about 95% transparent.

High -pressure sodium lamps are generally considered to be cheap lighting options. They generally transform about 50% of their consumed electricity into visible light. Are not as effective as low -pressure sodium lamps that are often considered one of the most 'Somewhat available lamps. First they require significantly larger bulbs. Second, they are almost completely unable to portray the color.

On the human eye, the light produced by high -pressure sodium lamps appears to be yellowish white. On the light spectrum, the light is actually orange to red. Compared to some other options, high -pressure sodium lamps also have poor color rendition, which limits the ability to show the true color of the human eye.

It will not prevent these lamps that can last for tens of thousands of hours to be popular. They are used worldwide for different purposes. In Horticulture, high -pressure sodium lamps are generally used in later stages of plants. They can also be found in industrial environments such as warehouses and factories, and are commonly used for outdoor lighting.

In Australia, this tends to be the most commonly used lamps for large road lighting. WasObserved that the yellow light they produce is absorbed instead of reflection, resulting in low brightness of the surrounding areas. Larger effects on lighting were achieved by shortening the poles and placing the lamps together.

High -pressure sodium lamps are not designed for immediate action on/off. If the power failure is turned off or, the cooling period usually requires 3 to 15 minutes before they can produce light again. This makes them less popular for internal residential use.