What is the voltage of the high pressure sodium lamp?
High pressure sodium lampWhen the high pressure sodium lamp is used, the golden colored light is generated, and the utility model has the advantages of high luminous efficiency, low power consumption, long service life, strong fog permeability, no insect trapping, etc.. Widely used in roads, highways, airports, docks, docks, stations, plazas, street junctions, industrial and mining enterprises, parks, courtyards, lighting and plant cultivation. High color high pressure sodium lamp is mainly used in stadiums, exhibition halls, casinos, department stores and hotels and other places lighting.
When the bulb is started, the arc tube arcing between the electrodes at both ends, due to the high temperature of arc tube to liquid sodium mercury vapor evaporation as mercury vapor and sodium vapor emitted from the cathode to anode electrons in the movement process, impact discharge atomic material to obtain energy, produce ionization or excitation, and then by the excitation return to the ground state; or by the ionized into an excited state to the ground state, then an infinite loop, at this time, the release of excess energy in the form of light radiation, will produce light. High pressure sodium vapor pressure in the discharge of material is very high, namely sodium atom density, sodium atom collision between electron and frequent, the resonance radiation broadening of spectral lines, there radiation in the visible spectrum, so the color is better than that of low pressure sodium lamp high pressure sodium lamp. High pressure sodium lamp is a kind of high intensity gas discharge bulb. Due to the negative resistance characteristics of gas discharge lamp, if the bulb alone received the power grid, the working state is unstable, with the discharge process continues, it will lead to the current in the circuit infinite rise, until the last lamp or circuit parts are overcurrent burned.
The fluctuation will supply voltage caused by lamp light and electric parameters; if the power supply voltage will cause the rise of bulb current increases, the arc tube cold end temperature increase, mercury and sodium vapor pressure increased, with the increase of the working voltage, the power of the bulb, causing the lamp life is greatly reduced; on the other hand, the power supply voltage is reduced, the light is not working properly and the decrease of luminous efficiency, may cause the bulb does not start or extinguish. Therefore, the requirements of customers in the use of light bulbs, the power supply voltage fluctuations should not be too large, generally required in the range of +6% to -8% range.
After the high pressure sodium lamp is started, the mercury vapor and xenon low pressure discharge at the initial stage. At this time, the lamp voltage is very low, a large current discharge process; with the continuation of the arc temperature gradually increased, mercury and sodium vapor pressure by the discharge tube cold end temperature, when the discharge tube cold end temperature reaches stable discharge will tend to be stable, light flux, voltage, current and power it is in normal working condition. Under normal working conditions, the whole start-up process takes about 10 minutes.
