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

High pressure sodium lamp is a very high luminous efficiency of the light source, its efficiency can be up to 100 LM / W, sodium lamp is divided into two kinds of high pressure and low pressure sodium lamp. A discharge tube made of a special glass is made of a special glass in the glass case, and the tube is filled with an appropriate amount of sodium, mercury drop and inert gas, the discharge tube and the glass shell are pumped into a vacuum to reduce the influence of the ambient temperature on the lamp. Low pressure sodium lamp amplitude injection soft yellow light, it can be divided into two kinds of DC and AC, the luminous efficiency than incandescent lamp high more than 10 times, can penetrate through the smoke, suitable as lighting in place to smoke more, also can do polarimeter, Polarimeter, refraction today optical instruments such as monochromatic light source, the lamp discharge tube general business growth and narrow the U shape, the temperature to remain at around 270 degrees, sodium vapour 5 Torr, so using a coated with infrared reflective film coat. And vacuum, in order to reduce the discharge loss. Sodium below 98 degrees is solid, its vapor pressure is very low, is not easy to make discharge arc, in order to make the lamp starting voltage reduction, in a discharge tube filled with neon, and mixed with less than 1% argon, although argon micro, but can make the lamp starting voltage reduced by about 50%. Due to the high temperature of the chemical reaction of sodium vapor is very strong, can be corrosive to most types of glass.

So the glass wall of the discharge tube is covered with a layer of sodium glass layer. In addition the discharge tube can also be used with high temperature sodium does not reflect the translucent or transparent alumina ceramics made of corundum. The basic structure of high pressure sodium lamp, mainly composed of filaments, bimetal thermal relay, discharge tube, glass shell, composition, put appliances made of translucent polycrystalline alumina ceramic, filled with mercury and mercury sodium agent, can produce very high pressure mercury vapor, filament by a tungsten filament made spiral or woven into the shape of a certain amount of alkaline earth metal oxides can be stored, when the heating filament, alkaline earth metal oxide emission of electrons. The role of double metal is: when the lamp is connected to a power source, current through the ballast, thermal resistance, double metal tablets to form passageway, thermal resistance heating, double metal pieces are disconnected, instant self induction electromotive force generated by the ballast to inner tube of inert gas ionization discharge, temperature, Mercury also with gasification discharge and the sodium a gas discharge light 3, metal halide lamp metal halide lamp mainly rely on metal halide as a luminescent material, metal halide in the form of solid presence in the lamp. Therefore, a small amount of hydrogen ignited gas or xenon lamp must be filled, so that light bulb.

The lamp is ignited, the first work in the state of low pressure arc discharge lamp, bipolar voltage is very low at this time, about 18 ~ 20V, the light output is small, then the main production of heat, so that the whole body heating lamp, metal halide lamp is introduced with the increase of temperature to evaporate, become metal halide vapor, the heat convection effect next, continue to flow to the arc center, part of the metal halide arc was 5500 ~ 6000K high temperature decomposition, a metal atom and the halogen atom, under the action of the electric field, the metal atoms are excited; the other part of the metal halide cannot be decomposed by electric arc of high temperature, high temperature and electric field in the dual role, directly stimulate the formation of molecular light is a xenon lamp