yellow
Sodium vapor and mercury vapor lamps emit yellow and bright blue light, respectively. They are very efficient, and provide high-intensity light suitable for illuminating large, open areas.
What is the efficiency of sodium Vapour lamp?
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 efficacies of about 150 lumens per watt.
Are sodium lamps hazardous?
High-pressure sodium lights often are used for street and highway lighting. When these lights are turned on, they can produce potentially harmful levels of ultraviolet radiation.
What are the advantages of sodium Vapour lamp?
WHAT ARE THE ADVANTAGES OF SODIUM VAPOUR LAMPS OVER OTHER LAMPS? Efficiency: Sodium Vapour Lamps are very efficient, turning one watt of power into a whopping 200 lumens! Compare this with the 12 lumens per watt of an incandescent bulb, or the 60 lumens per watt of a CFL, or the 90 lumens per watt of FTL.
Why do sodium lamps take time to glow?
The bulb has to heat up to a tremendous temperature (several thousand degrees celsius) to operate. As the light heats up, the internal salts evaporate and the quality of the light output changes. This takes time to get to full power (thus the warm-up period).
Why is sodium vapor yellow?
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 color S does sodium emit?
Because each element has an exactly defined line emission spectrum, scientists are able to identify them by the color of flame they produce. For example, copper produces a blue flame, lithium and strontium a red flame, calcium an orange flame, sodium a yellow flame, and barium a green flame.
What is minimum wattage of sodium Vapour?
1000W High Pressure Sodium Vapour Tubular Lamp
| Lighting Type | High Pressure Sodium Vapour |
|---|---|
| Brand | Venture |
| Country of Origin | Made in India |
| Wattage | 1000W |
| Minimum Order Quantity | 1 Piece |
Which lamp is cheapest for same wattage?
| Q. | Which of the following lamps is the cheapest for the same wattage? |
|---|---|
| A. | fluorescent tube |
| B. | mercury vapour lamp |
| C. | gls lamp |
| D. | sodium vapour lamp |
What was a major problem in producing a high pressure sodium lamp?
Although the sodium light requires less energy that other types of light and is more efficient, there are drawbacks to the use of these light sources. Metallic sodium reacts with the moisture in the air and can explode if the bulb is broken.
Do high pressure sodium lights contain mercury?
HPS lamps generally contain 10 to 50 mg of mercury. A small percentage contains more than 50 mg of mercury.
How does a high pressure sodium lamp work?
Basic Operation 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 the wavelength of light from a sodium vapor lamp?
A 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 . Two varieties of such lamps exist: low pressure and high pressure. Low-pressure sodium lamps are highly efficient electrical light sources,…
What is the power rating of a low pressure sodium light?
Low-pressure sodium. Unlike HID lamps, during a voltage dip low-pressure sodium lamps return to full brightness rapidly. LPS lamps are available with power ratings from 10 W up to 180 W; longer lamp lengths can, however, suffer design and engineering problems.
What are the different types of sodium lights?
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.
