The efficiency of a sodium vapour lamp under practical conditions is about 40-50 lumens/watt. Such lamps are manufactured in 45, 60, 85 and 140 W ratings. The average life is about 3000 hours and is not affected by voltage variations.
In the same way What are the advantages of sodium vapour lamp?
Advantages. Most energy efficient light source commercially available, with an efficacy of 100 to 185 lumens per watt. Lamps have average life in the 14,000 to 18,000 hour range and have excellent lumen maintenance (very little reduction in lumen output over life of lamp).
Subsequently, Why sodium Vapour lamps are used in street lights? It is most visible in street lighting. Sodium-vapour lamps are good for night-time illumination because of their high efficiency and because the light they produce penetrates mist and fog particularly well.
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.
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.
Which one is disadvantages of sodium Vapour lamp?
WHAT ARE THE DISADVANTAGES OF SODIUM VAPOUR LAMPS? Colour rendering: The colour rendition properties are not comparable to the other lamps- the white SON lamp has a Ra value of 80 while the SOX has a Ra of just 20 which is way below that of an Incandescent (Ra -100).
Why is sodium lamp used?
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 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 |
Are high pressure sodium lights being phased out?
Phasing out
A number of popular lighting types will have to be phased out by 2017 including selected ‘standard’ high-pressure sodium (including retrofit), high-pressure mercury, and standard performance metal halide.
Can I replace a high pressure sodium bulb with LED?
High pressure sodium bulbs (“lamps”) are an old standby for lighting that’s still used today in spite of so much talk of LED lights. … LEDs, however, are better able to control their light, which is why a lower-watt LED can replace a higher-watt high pressure sodium bulb.
Do mercury vapor lamps need a ballast?
A mercury vapor lamp is a type of high intensity discharge (HID) lamp that is typically used for commercial and outdoor lighting. … As with fluorescent lights, mercury vapor lamps require a ballast to supply the proper voltage and regulate the current to the electrodes.
Which gas is used in mercury Vapour lamp?
To facilitate starting of the lamp, a third electrode is mounted near one of the main electrodes and connected through a resistor to the other main electrode. In addition to the mercury, the tube is filled with argon gas at low pressure.
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.
Why are the street lights yellow?
Most street lights used in modern society are made using sodium vapor. There are two types – low-pressure sodium (LPS) and high-pressure sodium (HPS). … These gasses increase in temperature, which then vaporizes the sodium, creating the yellow-orange light that you see.
What is the minimum wattage of sodium Vapour lamp is?
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 |
What are high pressure sodium lamps used for?
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.
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.
What is a main disadvantage of mercury Vapour lamps?
The main drawbacks of high-pressure mercury vapour lamps are their slow 4-7 minute warm-up time, middling energy efficiency (about 50 lumens per watt), and inferior colour rendering compared to metal halide lamps.
What is the difference between sodium lamp and mercury lamp?
Answer: The light in Sodium Vapour lamp is from an atomic emission process whereas in Mercury Vapour Lamp it is, finally, from fluorescence emission. The mechanism of light emission in a sodium vapour lamp is simple and straight-forward.
How does sodium lighting 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 ignitor in sodium Vapour lamp?
Ignitors An ignitor is a starting device that generates voltage pulses to start a discharge lamp.
What is the minimum voltage of sodium Vapour lamps?
For this voltage of about 410 V is required while normal voltage is about 165 V. Supply is given through a leak transformer which has high leakage reluctance.
How many lumens is a 70 watt high pressure sodium bulb?
70-watt HPS bulbs provide between 6300 and 7000 lumens of light in frosted and clear options.
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