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.
Why is sodium used in street lights?
LPS lamps have been used widely for street lighting since the 1930s because of their efficiency (measured in lumens per watt) and the ability of their yellow light to penetrate fog. …
Where are sodium Vapour lamps commonly used?
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.
What are the advantages of sodium Vapour lamp?
Sodium vapour lamp is a gas discharging lamp which uses sodium in an excited state to produce light near 589 nm wavelength. These lamps are available in low pressure and high pressure varieties. Advantages: Most energy efficient among all artificial light sources.
What is the difference between mercury lamp and sodium lamp?
The mechanism in mercury vapour lamp is more involved and sequential. … Hence, the light from the mercury vapour lamp is white. Applications. Although sodium vapour lamps produce much higher light output (about 90 lumens/watt) they cannot be used in lighting applications where colour-rendering property is very crucial.
Why does sodium lamp gives out red light in the beginning?
Answer. Answer: When the lamp is first turned on the sodium is not properly vaporised yet. … After a short while the sodium metal is warmed by the activity of the Neon/Argon light, and the sodium metal vaporizes, the colour becomes the more normal bright orange/yellow we are used to.
Do high pressure sodium lights use a lot of electricity?
Do high pressure sodium lights use a lot of electricity? HPS or HID lights us about 2–3x the electricity as LEDs for the same amount of Lumens output. But about 1/2 to 1/3 of that of incandescent. So they’re a middle ground in terms of electricity consumption for the light output.
Which gas is used in mercury Vapour lamp?
In addition to the mercury, the tube is filled with argon gas at low pressure. When power is applied, if there is sufficient voltage to ionize the argon, the ionized argon gas will strike a small arc between the starting electrode and the adjacent main electrode.
How does the sodium Vapour lamp works?
The HPS lamp consists of a narrow arc tube supported by a frame in a bulb. The arc tube has a high pressure inside for higher efficiency. … The arc then heats up the mercury and the mercury vapor then lights, giving the lamp a bluish color. The lamp heats and the sodium is the last material to vaporize.
What are high pressure lamps?
High-pressure sodium lamps (also known as HPS Lamps or HPS lights) are a type of sodium lamp that is widely used in industrial lighting and many public outdoor areas. They are commonly used in public parking lots, roadways, and other security areas.
Which light is better yellow or white?
Here’s a breakdown of light bulb color temperature: Soft white (2,700 to 3,000 Kelvin) is warm and yellow, the typical color range you get from incandescent bulbs. This light gives a warm and cozy feeling and is often best for living rooms, dens and bedrooms. Warm white (3,000 to 4,000 Kelvin) is more yellowish-white.
Why is sodium light yellow?
A sodium light consists of an evacuated tube containing electrodes and metallic sodium. … In the vapor state, the sodium electrons are excited to higher energy levels When these electrons return to a lower energy level, light is given off. The yellow color is a product of the light emitted by the sodium electrons.
What is the efficiency of sodium Vapour lamp?
The power of sodium-vapor lamps is 45–200 watts (W), the service life is 5,000–7,000 hr, and the luminous efficiency is 100–170 lumens per watt (lm/W).
Why mercury is used in lamps?
Mercury is used in a variety of light bulbs. Mercury is useful in lighting because it contributes to the bulbs’ efficient operation and life expectancy. Fluorescent and other mercury-added bulbs are generally more energy efficient and last longer than incandescent and other equivalent forms of lighting.
Can I replace mercury vapor bulb with LED?
LED corn cob lights are one of the most efficient ways to replace metal halide, mercury vapor, and high-pressure sodium HID bulbs.
Do UV lamps have mercury?
Both UV and CFL bulbs contain very small amounts of mercury, less than 1/100th of the amount contained in a mercury thermometer. Just as all CFL bulbs There is no risk to human health when the bulb glass is intact and not damaged.