China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

HID lamp most work in AC state, the use of reactive devices as HID ballast. HID lamps have different types, according to the type of lamp and its application needs, can be configured in different forms of ballast circuit, in order to obtain the best matching ballast and lamp. As a general
The commonly used HID lamp for lighting a high-pressure mercury lamp, high-pressure sodium lamp and metal halide lamp. High pressure mercury lamp HID lamp is in the earliest development, stable product performance, supporting mature ballast circuit. High pressure sodium lamp and metal halide lamp is a new energy-efficient light source of modern development, requirements ballast and lamp has good matching, to achieve better comprehensive effect of high pressure sodium lamp and high pressure mercury lamp in the performance of different, high pressure sodium lamp not only mercury, but also filled with sodium, during operation of the lamp, sodium and mercury to form storage of liquid sodium and mercury gas in the discharge pipe of the cold end Part.

High pressure sodium lamp power during its lifetime, with the change of the lamp voltage change. The high-pressure mercury lamp (HPML) and different high pressure mercury lamp power changes in the lamp voltage relatively remained stable, because of the high pressure mercury lamp mercury vapor pressure in a saturated state. The relationship between high pressure sodium lamp voltage and lamp power is in the discharge tube contains excessive sodium caused by mercury gas based on. During the lamp work, only part of the mercury and the formation of sodium vapor pressure, the level of vapor pressure is reflected in the lamp voltage.

The discharge tube depends on the temperature at the "cold end". The change of the cold end temperature causes the change of the vapor pressure, resulting in the change of the lamp voltage, and the change of the lamp power. In a certain power range, the relationship between the lamp voltage and the lamp power is approximately linear.

The characteristic curve of the device should be able to make the lamp reach maximum power before the maximum voltage line, and then decrease with the increase of the lamp voltage. For a relatively flat ballast characteristic curve of a close relative to the lamp design power line is relatively steep rise and fall Characteristic curve more desirable d) in order to avoid shorten the lamp life, or work instability, ballast should can make the lamp away from the quadrilateral the right edge of the chart the headlight voltage characteristics of working in international standards for high pressure sodium lamp, lamps with different specifications to the ballast provides different quadrilateral diagram requirements. Such as the manufacture of Figure 6 ballast for high pressure sodium lamp is not complicated, but often due to differences in design, technology and selection of materials, with different specifications of the manufacturer of ballast equipped with high-pressure sodium lamp, showing a ballast characteristic curve of different shapes.

The poor quality of the ballast will cause the lighting used during the super load operation, work or not stability Na-T1-In metal halide lamp from European manufacturing technology, the excellent performance of the lamp start, equipped with general inductance type ballast circuit, only need to in power Voltage (220V), lower peak voltage plus (750V) trigger can start lamp. The photoelectric performance parameters of a stable light, with a long life (average life 20000h), the characteristics of high luminous maintenance rate. After the performance improvement of the Na-Tl-In type metal halide lamp, can be equipped with the same power type ballast for high pressure mercury lamp and high pressure sodium lamp ballast, and the average life of the metal halide lamp can still reach the required 20000h. In this way, the metal halide lamp can be replaced without replacing the original lighting device in the case of electrical appliances.

High-pressure mercury lamp and high pressure sodium lamp, it is better than the former improves the light efficiency and improve the light color, also than the latter greatly improved chromogenic properties. Main parameters of the changes see table 2Sc-Na metal halide lamp from the manufacturing technique of the United States, the discharge tube structure similar to high pressure mercury lamp, the lamp does not use the trigger and the use of the high open circuit voltage and lamp of the lamp's role, so that the lamp start work. If the Sc-Na type metal halide lamp uses the above Na-T1-h metal halide lamp working circuit, not only can make the early failure of the lamp to increase (trigger is easy to wear the bad light, the starting electrode) life expectancy lamp, and increase light attenuation. As shown in Figure 9 for using different metal halide lamp "inductance ballast and trigger circuit of the decay curves on the one hand improve discharge tube structure, the abolition of the starting electrode, as shown in Figure 10B and improve the chemical composition and manufacturing process, improve the starting performance of the lamp, so as to improve the performance of the lamp.

On the other hand, to improve the working circuit of the hps ballast, trigger to start the lamp work, so as to reduce the ballast of the open circuit voltage, that is to reduce the peak power Voltage and peak current. The working temperature of the HID ballast is also reduced and the life of the ballast is increased.