Comparison Between High Pressure Sodium Lamp and LED Lamp

Types of high pressure sodium lamps

1) Ordinary high pressure sodium lamp this kind of lamp uses atmosphere as starting gas, and the vapor pressure of sodium in discharge tube ensures the maximum luminous efficiency of the lamp. It is characterized by high light efficiency and long service life, but the light color is poor, and the general color rendering index is only 15-30. Therefore, it can only be used for lighting in roads, plant areas, etc.

2) The high-pressure sodium lamp directly replacing the fluorescent high-pressure mercury lamp is produced for the promotion of high-pressure sodium lamp. It can be directly used in fluorescent high-pressure mercury lamp ballasts and lamp devices of similar specifications.

3) In order to expand the application of high-pressure sodium lamp in indoor and outdoor lighting, the color temperature and color rendering of comfortable high-pressure sodium lamp are improved, so that the high-pressure sodium lamp is suitable for residential areas, industrial areas, retail commercial areas and public places.

4) The high luminous efficiency high-pressure sodium lamp is filled with high pressure neon in the lamp tube, so that the lamp can obtain high luminous efficiency and improve the color rendering index. It can be used as an energy-saving light source for indoor lighting, especially suitable for factory lighting and sports lighting.

5) High color rendering high pressure sodium lamp in order to meet the needs of high color rendering, people have successfully developed high color rendering high pressure sodium lamp, also known as white light high pressure sodium lamp. The improved lamp has a general color rendering index. Another important feature is that the color temperature increases to above, which is very close to incandescent lamps. Therefore, it has warm white tone and high color rendering, which plays a great role in beautifying the city and the environment. The lamp can be used for commercial lighting and lighting of high-end commodities such as gold jewelry, jewelry and precious leather goods, and the energy-saving effect is very remarkable.

Main features of high pressure sodium lamp

High pressure sodium lamp emits golden white light when used. It has the advantages of high luminous efficiency, low power consumption, long service life, strong fog permeability and no insect attraction. It is widely used in roads, expressways, airports, docks, docks, stations, squares, street intersections, industrial and mining enterprises, parks, courtyard lighting and plant cultivation. High color rendering high pressure sodium lamps are mainly used in gymnasiums, exhibition halls, casinos, department stores, hotels and other places.

Incandescent bulb emits warm color light when working, and its color rendering is excellent (color rendering index RA = 100). It is still a widely used lighting source for a long time since its birth. Although the use of high-pressure sodium lamp has many advantages, it has poor color rendering (RA = 30). In order to maintain the long life, high luminous efficiency and warm tone atmosphere of high-pressure sodium lamp; In terms of improving color rendering, people have developed high color rendering high-pressure sodium lamp (also known as white light high-pressure sodium lamp) which meets the above requirements through tireless efforts. Based on the high-pressure sodium lamp, the high color rendering high-pressure sodium lamp improves the color rendering by increasing the sodium vapor pressure and increasing the diameter of the arc tube, wrapping a layer of niobium foil at both ends of the arc tube and increasing the cold end temperature; In addition, by increasing the xenon pressure charged into the arc tube, the temperature of the central part of the arc increases, while the temperature of the rest of the discharge part is low. The color rendering is improved by changing the arc temperature distribution. Its color rendering index has been increased to RA = 70 80, and the luminous efficiency can reach more than 80 LM / W. it can broaden the application field and become a reality for using high color rendering high-pressure sodium to replace incandescent bulbs.

1、 Comparison between LED lamp and high pressure sodium lamp -- Analysis and comparison of energy efficiency

The lighting installation power of the two shall be compared on the premise of reaching the same illumination (brightness) level and approaching the lighting quality standard. Since the high-pressure sodium lamp high-power lamp tube (250 400W) has high light efficiency, up to 130 1401m / W, while the light efficiency of low-power lamp tube (100 150W) is about 80 1001m / W. the existing high-power LED street lamps mostly use 1wled tube, and their light efficiency is similar, so it is appropriate to analyze high-power street lamps and low-power street lamps respectively.

1. High power (≥ 250W) street lamp: high pressure sodium lamp has high efficiency. Considering ballast loss, lamp efficiency and light channel utilization, if the comprehensive efficiency is calculated as 0.55, the effective light efficiency of sodium lamp is about 70 751m / W; The effective luminous efficiency of LED street lamps is about 621m / W in the United States, and the best enterprises in China have reached 56 581m / W. Therefore, for high-power street lamps, the energy efficiency of LED lamps is lower than that of sodium lamps.

2. Low power (≤ 150W) street lamp: the effective luminous efficiency of sodium lamp (including the comprehensive efficiency of 0.55) is about 45 551m / W, while the LED is still calculated as 56 581m / W, so the LED can save energy by 10% 20% and up to 30% compared with sodium lamp. From the above analysis, it can be seen that when the low power (≤ 150W) is used for the branch, the LED street lamp can save energy by 10% 30% compared with the sodium lamp, while the high power still can not compare with the energy efficiency of the sodium lamp. Therefore, those who generally claim that led street lamps are more energy-saving than high-pressure sodium lamps, and even can save 50% and 60% energy, are obviously exaggerated and hyped. We should adhere to the principle of scientific analysis and seeking truth from facts, otherwise it is easy to mislead users and the masses.

2、 Comparison between LED lamp and high pressure sodium lamp -- Analysis of light source color on road lighting effect

The relevant color temperature (TCP) of high pressure sodium lamp is about 2100K, which belongs to warm color temperature. Its color rendering index (RA) is only 23 25, and the color rendering is low; The color temperature of LED street lamps is more than 5300k, which is a good product with cold color temperature. Its RA can reach 70 80 and has good color rendering.

3、 Comparison between LED lamp and high pressure sodium lamp -- economic analysis and comparison

High pressure sodium lamps, each set is about 1200 1500 yuan; At present, the price of LED street lamps varies greatly according to the power, about 4000 8000 yuan. In terms of the current situation, LED street lamps are obviously too expensive, and the price is as high as 3 5 times. As before? LEDs less than 150W can save energy by 10% 30% and save about 50 150kwh per lamp every year. It is impossible to recover the extra cost of purchasing lamps. It can only be expected that in the next few years, according to the development trend of LED, its price will gradually decline, energy efficiency will be further improved, and then its economic performance will be compared.

4、 Comparison between LED lamp and high pressure sodium lamp -- service life analysis

The comparison of service life should be based on the service life of the whole lamp. High pressure sodium lamps include light sources, electrical accessories (mainly ballasts and triggers) and lamps. The average service life of sodium lamps used in street lamps is 3 5 years, and the energy-saving inductive ballasts will not be less than 20 years, as well as lamps.

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What Are Araya Rims Made of? Should I Replace Them?
Um from experience new 700c wheels have curve in the rim wall so the tire bead stay even at high pressure .but that nice vintage aray rim wall has no curve in the rime because it was not designed for high pressure tires . Old rims mostly was disigned for low pressure gumwall tire for a comfortable ride . In the bicycle world the old bouncy steel smooth tire 10 speed was considered a Cadillac because of its smooth ride.^,^1. Have any experiments been performed on the magnetic properties of neodymium at high pressure and temperature?Do not think that pure Nd is ferromagnetic (maybe it's antiferromagnetic?), so your question about the Curie temperature really applies to just certain ferromagnetic alloys of Nd. Not aware of any high-P studies on those ferromagnetic alloys offhand. I was a co-author of a paper that looked at the magnetic properties of the heavy lanthanides (which are ferromagnetic) under pressure, and we found that their Curie temperatures dropped with pressure at a $dT_c/dP$ rate of around -10 to -20 K/GPa (See High-pressure magnetic susceptibility experiments on the heavy lanthanides Gd, Tb, Dy, Ho, Er, and Tm). If Nd alloys have $T_c's$ which drop at similar rates, then I would not expect any magnetism in them at the pressure and temperature of the core-mantle boundary (140 GPa and 5000 C)2. 3 ton tempstar heatpump with a 3.5 ton airhandler on a 45 deg, day what should the low and high pressure be?I very much doubt a setting done by a technician charging a system such as yours. First, you cannot do that with two gages. Its not even possible, and second there is NO exact pressure setting for a given system. It depends on air pressure, humidity and relative humidity to set the charge of gas correctly which would result in a "correct pressure " reading. The method most commonly used is a "super heat" method. Here a sling is swirled thru the air and the RH of the air is determined. Next, the exit air from the air blower inside the house is determined. Along with the outside and inside air temps. Then and only then, a chart inside the cabinet of the AC or heat pump is read to find the correct charge pressure. Without taking any of these needed measurements, no pressure reading can be determined. What is happening nation wide is the charging of these new high efficiency units is being done incorrectly, and given that the efficiency numbers that people paid so much for to get (the SEER) are no where near reached. Ive yet to see a service tech ever properly charge a system NEVER ever saw it done. If you want to find out exactly how to charge an AC and what pressures your system is required to have for a given temps and given RH. get a manual and read it as that is a very good way to learn about it so you would never be fooled. X Trane Engineer.3. Metal Halide vs High Pressure Sodium for plants?Be careful as these lamps generate a lot of heat. You will need some sort of ventilation to avoid overheating the plants. Keep in mind law enforcement agencies look for thermal signatures to find illegal pot production.4. Easy questions about weather?! Ten points!?Atmospheric pressure at the Earth's surface is one of the keys to weather, which is one reason weather maps feature H's and L's, representing areas of high and low air pressure. High and low pressure areas are important because they affect the weather. The weather maps, such as those on television, show what is happening at the Earth's surface, and that's what we are talking about here. As the name says, a "high" is an area where the air's pressure is higher than the pressure of the surrounding air. A "low' is where it's lower. Meteorologists do not have any particular number that divides high from low pressure; it's the relative differences that count. The pressure is high at the surface where air is slowly descending - much too slowly to feel. And, this is going on over a large area, maybe a few hundred square miles. As air descends, it warms, which inhibits the formation of clouds. This is why high pressure is generally - but not quite always - associated with good weather. The air that descends in high-pressure areas has to get to high altitudes in some way, and its done by rising in areas where the pressure at the surface is low. As air rises it cools. As the air cools, the humidity in it begins to condense into tiny drops of water, or if it's cold enough, into tiny ice crystals. If there's enough water or ice, rain or snow begin to fall. This is why low pressure is associated with bad weather. As shown in the graphic above, the air descending in high pressure flows out in a clockwise spiral in the Northern Hemisphere. Air flowing into an area of low pressure rises, making a counterclockwise spiral on the way in.
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