Principle of metal halide lamps
The metal halide lamp is a discharge lamp that works with an AC power source and generates arc discharge in the mixed vapor of mercury and rare metal halides. The metal halide lamp is the third type made by adding various metal halides on the basis of the high-pressure mercury lamp. Substitute light source. Scandium-sodium metal halide lamps are used for lighting. Metal halide lamps have the characteristics of high luminous efficiency, good color rendering performance, and long life. They are a new energy-saving light source close to daylight color. Only 23% of the total radiation of the mercury arc is in the visible light region, while more than 50% of the total radiation of the metal halide arc is in the visible light region, and the luminous efficiency of the lamp can be as high as 120lm/W or more. The ignition of the metal halide lamp also requires a ballast, and its working current is larger than that of the high-pressure mercury lamp of the same power.
The principle of LED lights
LED (Light Emitting Diode), is a solid-state semiconductor device that can convert electrical energy into visible light, and it can directly convert electricity into light. The heart of LED is the wafer of a semiconductor, and one end of wafer is attached on a bracket, and one end is negative pole, and the other end connects the positive pole of power supply, and whole wafer is encapsulated by epoxy resin. Semiconductor wafer is made up of two parts, a part is P-type semiconductor within hole occupies an leading position, the other end is N-type semiconductor which mainly is electron. But when these two kinds of semiconductors couple together, they form a P-N junction. When the current acts on the wafer through the wire, the electrons will be pushed to the P region, where the electrons and holes recombine, and then emit energy in the form of photons, which is the principle of LED light. The wavelength of light, which is also the color of light, is determined by the material that forms the P-N junction.
- The difference between light source types:
Metal halide lamps are thermal light sources; LED lights are cold light sources.
LED energy conservation, in addition to converting into visible light, the excess energy will be dissipated in other ways.
- The differences in the form of excess energy dissipation:
Metal halide lamps dissipate excess energy by means of infrared rays and ultraviolet rays, but infrared rays and ultraviolet rays will affect product quality and have an impact on human physiology;
LED light generates heat through the light source device and loses excess energy, and the heat conduction is extremely easy to control.
- The difference between the housing temperature:
The housing temperature of the metal halide lamp is very high, which can exceed 130 degrees;
The housing temperature of the LED light is extremely low, normally below 75 degrees, and the low temperature of the LED housing can greatly increase the safety and life of cables, wires, and supporting electrical appliances.
- The difference in vibration resistance:
The filament and bulb of the metal halide lamp are easily damaged and have poor vibration resistance;
The light source of the LED light is an electronic component, which is inherently anti-vibration. LED lights have unparalleled advantages in vibration resistance.
- The difference in light distribution performance:
The light distribution performance of metal halide lamps is difficult, the waste is large, the spot is uneven, a large reflector is required, and the lamp is large in size;
The LED light line is extremely easy to control, and it can achieve a variety of light distribution under the same volume, and the light spot is uniform. The convenient feature of LED light distribution can greatly save the waste and improve the system light efficiency.
- The difference between anti-grid voltage interference:
Metal halide lamp: poor, the power of the lamp changes with the fluctuation of the grid voltage, it is easy to overload;
LED light: stable, constant current power supply can keep the power of the light source unchanged when the grid voltage fluctuates. The LED lamp can work normally during the fluctuation of the grid voltage from 90-265 volts, and has no effect on the light source and lifespan.
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