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High pressure sodium lamp is usually a quite high luminous efficiency of the light supply, its efficiency is often up to a hundred LM / W, sodium lamp is divided into two sorts of higher pressure and reduced stress sodium lamp. A discharge tube made of a exclusive glass is created of a particular glass while in the glass case, and the tube is full of an appropriate quantity of sodium, mercury drop and inert gasoline, the discharge tube and also the glass shell are pumped into a vacuum to reduce the influence in the ambient temperature about the lamp. Lower pressure sodium lamp amplitude injection soft yellow light, it may possibly be divided into two types of DC and AC, the luminous efficiency than incandescent lamp higher more than ten times, can penetrate through the smoke, suitable as lighting in place to smoke additional, also can do polarimeter, Polarimeter, refraction currently optical instruments such as monochromatic light source, the lamp discharge tube general business enterprise development and narrow the U shape, the temperature to stay at all around 270 degrees, sodium vapour 5 Torr, so applying a coated with infrared reflective film coat. And vacuum, so that you can cut down the discharge loss. Sodium under 98 degrees is solid, its vapor stress is very minimal, will not be uncomplicated to produce discharge arc, so that you can make the lamp commencing voltage reduction, inside a discharge tube full of neon, and mixed with much less than 1% argon, while argon micro, but can make the lamp starting voltage decreased by about 50%. Due to the higher temperature of your chemical response of sodium vapor is very strong, could be corrosive to most sorts of glass.

So the glass wall from the discharge tube is covered with a layer of sodium glass layer. In addition the discharge tube may also be employed with large temperature sodium won't reflect the translucent or transparent alumina ceramics produced of corundum. The basic framework of high pressure sodium lamp, mainly composed of filaments, bimetal thermal relay, discharge tube, glass shell, composition, place appliances made of translucent polycrystalline alumina ceramic, full of mercury and mercury sodium agent, can develop pretty high pressure mercury vapor, filament by a tungsten filament created spiral or woven in to the form of the specified quantity of alkaline earth metal oxides may 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 energy supply, latest through the ballast, thermal resistance, double metal tablets to type passageway, thermal resistance heating, double metal pieces are disconnected, immediate self induction electromotive force created through the ballast to inner tube of inert gas ionization discharge, temperature, Mercury also with gasification discharge along with the sodium a gas discharge light three, metal halide lamp metal halide lamp primarily depend on metal halide being a luminescent material, metal halide within the form of strong presence while in the lamp. Hence, a modest amount of hydrogen ignited gasoline or xenon lamp needs to be filled, in order that light bulb.

The lamp is ignited, the initial operate while in the state of low strain arc discharge lamp, bipolar voltage is extremely minimal at this time, about 18 ~ 20V, the light output is tiny, then the key production of heat, so that the entire entire body heating lamp, metal halide lamp is introduced with the improve of temperature to evaporate, come to be metal halide vapor, the heat convection impact up coming, proceed to flow towards the arc center, portion in the metal halide arc was 5500 ~ 6000K substantial temperature decomposition, a metal atom and also the halogen atom, beneath the action of your electric discipline, the metal atoms are fired up; the other part with the metal halide can't be decomposed by electric arc of high temperature, substantial temperature and electrical area in the dual role, right stimulate the formation of molecular light can be a xenon lamp.