What method can be used to detect the good and bad of metal halide lamps?

The X-ray generation process is to first turn on the power supply, pass through a step-down transformer, and heat the X-ray tube filament to generate free electrons and gather near the cathode. When the step-up transformer provides high-voltage electricity to the two poles of the X-line tube, the potential difference between the cathode and the anode increases sharply, and the free electrons in the active state are strongly attracted, so that the bundled electrons travel from the cathode to the anode at high speed and hit the atomic structure of the anode tungsten target. At this point, an energy conversion occurs, in which less than 1% of the energy forms X-rays, and the remaining more than 99% is converted into heat.

The former is mainly emitted by the X-ray tube window, and the latter is emitted by the heat dissipation facility.

1. Use the digital multimeter 200 gears to measure its resistance value below 200 ohms. Measure the insulation resistance of the digital multimeter to more than 20k, the larger the resistance value, the better.

2. Use a 2500V megohmmeter to lap the two poles of the bulb, from slow to fast, the light is good, and the light bulb is not bad.

3. The substitution method is the simplest and most practical.

4. The resistance of the rectifier seems to be around 9, and the lamp can be tested with a 500V shake meter, and a good lamp shaker will be lit.

Metal halide lamp is a relatively advanced light source, long life, high light efficiency, good color rendering of the new energy-saving light source.

It mainly relies on metal halides as luminescent materials, and metal halides exist in solid form in lamps. Therefore, the lamp must be filled with a small amount of induced combustible gas hydrogen or xenon in order to ignite the bulb. After the lamp is ignited, it first works in the state of low-pressure arc discharge, at this time the voltage of the two poles of the lamp is very low, about 18 20V, and the light output is also very small, at this time, it mainly produces heat energy to heat the whole lamp body.

The metal halide introduced into the lamp continues to evaporate with the increase of temperature, becoming metal halide vapor, under the action of thermal convection, it continues to flow to the center of the arc, and a part of the metal halide is decomposed by the arc 5500 6000K high temperature to become metal atoms and halogen atoms, under the action of the electric field, the metal atoms are excited to emit light.

Advantages of metal halide lamps:

The luminous efficiency is particularly high, the luminous efficiency is as high as 80 90lm w, and the heat is less when emitting light normally, so it is a cold light source. Because the spectrum of metal halide lamps is superimposed on the basis of continuous spectrum with dense linear spectrum, the color rendering index is particularly high, that is, the color reproduction is particularly good, up to 90%.

The color temperature of metal halide lamps is high, up to 5000 6000K, and special projector lamps can reach 7000 8000K. Under the same brightness conditions, the higher the color temperature, the brighter it will be perceived by the human eye.

A metal halide lamp is a gas-discharge light source that provides illumination through a high-pressure mixture of argon, mercury, and metal halides through an electric arc.

Similar to fluorescent and mercury vapor lamps, metal halide lamps are distinguished by their high light output and different colors. Due to their relatively small size and high power rating, these lights are widely used in stadium lighting, factories, warehouses and outdoor flood lighting applications.

Metal halide lamps have a considerable range of power ratings, typically including models from 150 to 1200 watts. These lamps require special ballast accessories to function properly, and the operating gas discharge lamps belong to a family of light sources for high-intensity HID lamps.

Product Selection Guide

It is suitable for places that require high illumination and good color rendering, such as gymnasiums, art museums, exhibition halls, etc. High light efficiency can be achieved by using mixed light illumination, and the light color can also be improved. It is suitable for street lighting, bustling street lighting.

Flood lights or high pole lighting, high pole lighting can be set up in overpasses, squares, stations, docks, etc.

Metal halide lamps should be used in places with high hanging conditions and large areas of lighting. When the power supply voltage of the gas discharge lamp fluctuates greatly in an instantaneous manner, the lamp will be extinguished by itself, especially for some light sources that cannot be started immediately after being extinguished. A certain safety factor should be considered, so that the instantaneous voltage change of the power grid is not lower than a certain allowable value.

Inductive ballasts are mostly used in gas discharge lamps, and the power factor is less than 1. In order to save non-ferrous metals and improve the utilization rate of equipment, compensation should be considered to improve the power factor, and it is generally more convenient to use centralized compensation method.

When selecting the conductor cross-section and the capacity of the lighting transformer, it is necessary to calculate not only the electrical power consumed by the light source, but also the power lost by the ballast.

First remove the bulb, clamp the two ends of the bulb with the two wires of the megohmmeter (commonly known as the shake meter), and then rotate the megohmmeter to make its speed reach about 200 rpm, and find that the bulb is a little bright, indicating that the bulb is good. Mainly for prevention, the metal halide to a certain time, although it is still bright, but its brightness is greatly reduced, at this time if the light is turned on, it is likely to damage the ballast, trigger, capacitor. Therefore, I recommend that the bulb be replaced firmly once the service life of the bulb is up, if the voltage is stable.

You try.

Osram's and GE's can be, and the domestic Yaming is also good, but it is still recommended to buy imported, and the two types of 250W and 400W for road lighting applications are almost the same But I recommend using high-pressure sodium for road use.

Generally, it is okay to use metal halide in the community, but since it is a community, it is more practical to use energy-saving lamps.

Regular shopping malls.

**Around 200 is about the same.

Possible causes of broken metal halide lamps:

1. The problem of ballast. Look at the ballast, whether it is yellow. You can also smell the ballast, whether it smells burnt or not.

2. a light bulb. See if the bulb liner burns out.

3. Triggers. If it burns out, it will smell bad.

Metal halide lamp (metal halide lamp) is a discharge lamp that works with AC power supply and produces arc discharge and luminescence in the halide mixed vapor of mercury and rare metals, and the metal halide lamp is a third-generation light source made of adding various metal halides on the basis of high-pressure mercury lamp.

The lighting adopts scandium-sodium metal halide lamp, which has the characteristics of high luminous efficiency, good color rendering performance and long life, and is a new energy-saving light source close to the daylight color, which is widely used in indoor lighting in stadiums, exhibition centers, large shopping malls, industrial plants, street squares, stations, docks and other places.

The metal halide lamp is broken, not necessarily the bulb is broken, it is likely that the metal halide lamp ballast is broken, my personal opinion is to take down the light source of the metal halide lamp that you can't light up and put it on the metal halide lamp that you can light up, to see if it can still be lit, if it can be lit, it proves that the ballast of the metal halide lamp that you can't light up is broken (at this time you need to replace it with the ballast), if it can't be lit, the bulb is broken. The same principle, of course, you can take down the light source of the metal halide lamp that is on, and put it on the metal halide lamp that you think can't light up, and if it can be lit, it proves that your broken metal halide lamp is the light source is broken, and if it can't be lit, it proves that your broken metal halide lamp is the ballast is broken! Of course, low voltage may also cause the metal halide lamp to not light up or be delayed for a while!

It can't be measured with a multimeter.

Generally, we use high-frequency detectors to fight. If not.

You can use an Accord mosquito swatter. Connect the lamp head and base with wires. Then connect the mosquito swatter. If you can make an arc, then it means that the bulb is not a big problem.

There is also the most trouble-free way, where to buy it and where to send it.

Say the bulb is broken. A one-year warranty is required.

That's what I usually do, and that's how my clients come to me.

Oh, yes.

Metal halide lamps do not support frequent start-up, whether it is a lamp or a rectifier!!

The multimeter can't measure whether the bulb is good or bad You're the best I can't tell.

Metal halide lamp is a discharge lamp that produces arc discharge and luminescence in the halogen mixed vapor of mercury and rare metals, and the metal halide lamp is a third-generation light source made of adding various metal halides on the basis of high-pressure mercury lamp. The metal halide lamp has the characteristics of high luminous efficiency, good color rendering performance and long life, and is a new energy-saving light source close to the daylight color, which is widely used in indoor lighting in stadiums, exhibition centers, large shopping malls, industrial plants, street squares, stations, docks and other places.

Advantages and disadvantages: The biggest advantage of metal halide lamps is that the luminous efficiency is particularly high, with a luminous efficiency of up to 80 120lm w. Because the spectrum of metal halide lamps is superimposed on the basis of continuous spectrum with dense linear spectrum, the color rendering index is particularly high, that is, the color reproduction is particularly good, and the RA can reach 90.

In addition, the color temperature of metal halide lamps is high, up to 5000 6000K, and special projector lamps can reach 7000 20000K. Under the same brightness conditions, the higher the color temperature, the brighter it will be perceived by the human eye. Due to the limitations of materials and processes, the current domestic metal halide lamp has a service life of 8000 hours.

The biggest advantage of metal halide lamp is that the luminous efficiency is particularly high, the luminous efficiency is as high as 80 90lm w, and the heat is less when emitting light normally, so it is a cold light source. Because the spectrum of metal halide lamps is superimposed on the basis of continuous spectrum with dense linear spectrum, the color rendering index is particularly high, that is, the color reproduction is particularly good, up to 90%. In addition, the color temperature of metal halide lamps is high, up to 5000 6000K, and special projector lamps can reach 7000 8000K

Under the same brightness conditions, the higher the color temperature, the brighter it will be perceived by the human eye.

Due to the limitations of materials and processes, the life of domestic metal halide lamps is still less than 1000 hours, and the life of imported metal halide lamps can reach thousands of hours.

Another disadvantage of metal halide lamps is the difficulty of starting, which necessitates the use of specialized triggers. The brightness system gradually increases after starting, if the starting energy is too large and the starting speed is too fast, it will affect the life of the bulb, which should be fully considered in the circuit design.

Here's how it works:

1. The arc tube is filled with mercury, inert gas and more than one metal halide.

During operation, the mercury evaporates, and the mercury vapor pressure in the arc tube reaches several atmospheres (a few tenths of a megapascal). The halides also evaporate from the tube wall and diffuse into the high-temperature arc column to decompose, and the metal atoms are excited by ionization and radiate out the characteristic spectral lines. , when the metal ions diffuse back to the tube wall, they meet the halogen atoms in a cooler region close to the tube wall and recombine to form halide molecules.

This cyclic process continuously supplies metal vapor to the arc. The partial pressure of metal vapor at the axis of the arc is similar to that of the halide vapor at the pipe wall, generally 1330 13300pa. The average excitation potential of the metal used is about 4 EV, while the excitation potential of mercury is.

The total radiant power of the metal spectrum can significantly exceed that of mercury. As a result, the spectral lines of a typical metal halide lamp output are predominantly metallic. The color rendering of the lamp can be improved by filling with different metal halides (the average color rendering index Ra is 70 95).

Only 23% of the total mercury arc radiation is in the visible region, while more than 50% of the total radiation of the metal halide arc is in the visible region, and the luminous efficiency of the lamp can be as high as more than 120 lm w.

2. Chemical reactions between metal halides and electrodes, quartz glasses and halides will occur at high temperatures. Metal halides are prone to deliquescent, and the inhalation of a very small amount of water can cause abnormal discharge and blacken the lamp. Dysprosium oxide, yttrium oxide, scandium oxide, etc., are used in the electrode electron emission material to prevent the emitting substance from reacting with halogens.

Some metals (such as sodium) in the arc tube will migrate, and as a result, there will be an excess of halogens, resulting in extremely strong halogen electropower, causing arc contraction and an increase in the starting voltage and working voltage.

3. The metal halide lamp can not be reliably started only by the action of the trigger electrode, and the bimetal sheet starter is generally used, or the magnetic flux leakage transformer with a sufficiently high starting voltage is used, and the electronic trigger is also used. The ignition of metal halide lamps also requires a current limiter (i.e., ballast), which operates at a higher current than a high-pressure mercury lamp of the same power.