Introduction to the Characteristics of Metal Halide Lights

Is the light efficiency of the metal halide lamp high?

Metal halide lamp is one of the best electric light sources in the world. It has high luminous efficiency (65~140lm/w), long life (5000~20000h), good color rendering (Ra65~95), compact structure and stable performance Features. It has the advantages of fluorescent lamps, high-pressure mercury lamps, and high-pressure sodium lamps, and overcomes the defects of these lamps. The metal halide lamp brings together the main advantages of gas discharge light sources, especially the three major advantages of high luminous efficiency, long life, and good light color. Therefore, metal halide lamps have developed rapidly and have more and more applications.

The Basic Characteristics of Metal Halide Lamps

The metal halide lamp is the same as other gas discharge lamps. The filling of the lamp contains mercury. Mercury is a toxic substance. When the lamp is made and injected with mercury, careless handling will cause pollution to the production environment and damage the health of workers. When exhausting, a small amount of mercury vapor is discharged. If it is not handled properly, it will be directly discharged into the atmosphere. When the lamp used is damaged, it will pollute the environment.

A gas discharge lamp that emits light from a mixture of decomposition products of metal vapor (such as mercury) and halides (such as halides of elements such as dysprosium, sodium, thallium, and indium). It has the characteristic spectral line of adding metal, so the light color is improved and the light effect is also improved. The correlated color temperature of this kind of lamp is about 4000K, the color rendering index is 70, and the luminous efficiency is above 70lm/W.

The product parameters of the metal halide lamp adopt the unique olive shape design of the international leading arc tube, which can bring excellent light color consistency. Effectively solve the uneven color distribution caused by light color drift. The bracket installation structure without solder joints can prevent the solder joints of the bracket from breaking due to high temperature oxidation or oscillation, and further improve the reliability of the bulb. The arc tube is not restricted by the ignition position and can achieve ignition at any position. The luminous efficiency is extremely high, 20% higher than ordinary metal halide lighting. The average luminous efficiency of HPl400/ED/UP/4K is 110lm/w.

Used on a reasonable lighting circuit, it has a better protective effect on the electrode of the lamp, and can make the life of the lamp longer. The longest can reach more than 20,000 hours. High luminous efficiency and long life can reduce the number of light sources, electrical appliances and lamps used in the project, reduce the number of bulb replacements, and thus reduce overall maintenance costs. Suitable for vertical ignition and horizontal ignition, and the vertical ignition effect is better. It is most suitable for lighting in factories, large stores, shopping malls, buildings, advertisements, airports and other places that require high light and color consistency.

The spectrum of a metal halide lamp

Full-spectrum metal halide lamps can emit light that is most similar to natural light, because the light they emit is full-spectrum, that is, all light waves have. It includes all colors of visible light, and a small part of ultraviolet light.

The full-spectrum metal halide lamp is a discharge lamp that is operated by an AC power source and produces arc discharge in the mixed vapor of mercury and rare metal halide. The metal halide lamp is made by adding various metal halides to the high-pressure mercury lamp. The third generation light source. The lighting adopts a sodium scandium metal halide lamp, which has the characteristics of high luminous efficiency, good color rendering performance, and long life. It is a new energy-saving light source close to daylight. It contains unique powders and pills and is widely used in indoor crawling. Animal feeding supplement light can synthesize vitamin D3 to promote bone growth. It is the best supplement light lamp for reptile feeding so far.

It has the characteristics of high light efficiency, long life (8000～20000h), color temperature (4000-10000k) and good color rendering (Ra65～95), compact structure and stable performance. It combines the advantages of fluorescent lamps, high-pressure mercury lamps, and high-pressure sodium lamps, and overcomes the defects of these lamps. The metal halide lamp brings together the main advantages of gas discharge light sources. Especially the three advantages of high light efficiency, long life and good light color. The metal halide is filled into the arc tube, and the electric light source is excited by the ionization of metal atoms. The unique ultraviolet powder inside has the characteristics of high luminous efficiency, high color temperature, and good color rendering.

The full-spectrum metal halide lamp has two different spectral output frequencies, desert type and rainforest type, which can effectively meet the needs of rainforest and desert animals, and effectively replace traditional high-pressure mercury lamps and high-pressure sodium lamps to become the best light implement for crawler animals today.

Why does metal halide lamp strobe?

Stroboscopic is because of the arc of the lamp changes with the influence of the power frequency, resulting in arc fluctuations, resulting in eye flicker, uncomfortable feeling. The thermal inertia of thermal radiation light source (incandescent lamp) is large, so the flicker feeling is not obvious, but the phenomenon of gas discharge lamp is more obvious.

Main factors of strobe

1. The technical mechanism of producing stroboscopic is complex, including the factors of power supply, lamp making process and illumination.

The reasons of unreasonable design and so on. And it is the result of many factors.

2. The power supply frequency of the electric light source is low. At the present stage, the vast majority of HID are powered directly by the 50 Hz power frequency sinusoidal alternating current. Its stroboscopic frequency is 50 Hz * 2 = 100 Hz and fluctuates in a sine wave pattern. The power supply voltage of electric light source fluctuates greatly. At present, the fluctuation range of instantaneous voltage value of power frequency AC power supply in China is between 10% and 20%, which greatly aggravates the stroboscopic depth with frequency of 100Hz and sine wave fluctuation.
3. Matching of lamp and electric appliance.
4. Stroboscopic is related to the lamp making process, such as the size of arc tube, electrode material shape, electrode coaxiality, cold end shape, metal halide pill, etc. It is related to the distance between the poles, the length of the chamber, the voltage of the lamp and the temperature distribution of the tube wall.
5. The strobe of polished surface (mirror reflection) is heavier than that of polished surface (diffuse reflection), and the strobe of narrow angle is heavier than that of wide angle.

How to Avoid Strobe

1. Try to control the allowable deviation of power supply voltage (no more than 4 light sources in parallel on the same branch) and the allowable frequency deviation, grid harmonic and allowable unbalance of three-phase voltage.
2. Select better electrode, strict requirements for the production process.
3. Choose some good inductive ballasts.

What determines the color temperature of MH lamp?

The color temperature of metal halide lamp is mainly determined by the proportion of metal halide.

1. The consistency of the internal factor arc tube (mercury charge, electrode gap, discharge cavity shape, size, etc.) determines the consistency of the lamp cold point temperature, which affects the density of halide, thus determines the consistency of the lamp related color temperature.
2. External factors, many factors have an impact on the color temperature of the lamp.
   ★ Different types of lamps and lanterns will change the temperature of the lamp cold point, thus affecting the light color (related color temperature).

★ different ignition points have influence on the color temperature of the lamp.

★ the fluctuation of the power supply voltage also affects the color temperature of the lamp.

★ The electrical parameters of ballast are not consistent. If the American standard line is used, the dispersion of matching capacitance parameters will also have an impact.

Why is the color temperature inconsistent after 2000 hours of ignition?

Characteristics of quartz metal halide lamp:

1. the color difference and gradual drift of single light source of quartz metal halide lamp are normal phenomena, especially for low color temperature (such as 3000K). At 5000K, the color temperature of human eyes decreases, which improves the consistency of color temperature, because the domestic products are mainly sodium scandium metal halide bubbles, and their color temperature is about 4000K（ So it is difficult to guarantee the consistency of color temperature. Although the color temperature deviation of national standard in this aspect is + / – 300K, it is easy to see the difference of color temperature. According to the national standard nominal qualified color temperature of the quartz metal halide lamp, from the two ends of the light source color temperature difference, multiple light sources after comparison will also have color temperature difference.
2. Each manufacturer produces quartz metal halide lamp, and it is only 30 minutes to light the lamp before leaving the factory. However, other performance problems such as color temperature of quartz metal halide lamp are relatively stable, and it is reliable after lighting for 100 hou
3. In order to ensure the life of the light source, it is required to turn off the quartz metal halide lamp at least once a week.
4. In order to ensure the consistency of color temperature of light sources, it is suggested that users should not more than 4 light sources in parallel on the same branch even if the wire specification is enough, so as to reduce the change of voltage.
5. As the lighting time increases, silicon, the main component of quartz, chemically reacts with metal halides to form silicic acid metals and ultimately affect the chemical cycle in the arc tube.