Principle of metal halide lamp

The metal halide lamp is a discharge lamp that operates on an AC power source and generates arc discharge in the mixed vapor of mercury and rare metal halide. The metal halide lamp is a third-party lamp made by adding various metal halides to the high-pressure mercury lamp. generation light source. The lighting uses scandium-sodium metal halide lamps. 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 that is close to daylight color.


LED light principle LED light is an electroluminescent semiconductor material chip, which is solidified on the bracket with silver glue or white glue, and then connects the chip and the circuit board with silver or gold wires, and is sealed with epoxy resin around to protect the interior. The role of the core wire is to install the outer shell at the end, so the LED lamp has good earthquake resistance.


LED (Light Emitting Diode) is a solid-state semiconductor device that can convert electrical energy into visible light. It can directly convert electricity into light. The heart of the LED is a semiconductor chip. One end of the chip is attached to a bracket, one end is the negative electrode, and the other end is connected to the positive electrode of the power supply, so that the entire chip is encapsulated in epoxy resin.


The semiconductor wafer is composed of two parts. One part is a P-type semiconductor, in which holes dominate, and the other end is an N-type semiconductor, where electrons are mainly present. But when these two semiconductors are connected, a P-N junction is formed between them. When current acts on the wafer through the wire, the electrons will be pushed to the P region, where the electrons will recombine with holes, and then energy will be emitted in the form of photons. This is the principle of LED light emitting. The wavelength of light, that is, the color of light, is determined by the material forming the P-N junction.

The difference between metal halide lamps and LED lamps The difference between metal halide lamps and LED lamps is: light source type, excess energy dissipation form, lamp shell temperature, vibration resistance, light distribution performance and resistance to grid voltage interference.

  1. Differences in light source types: Metal halide lamps are hot light sources; LED lamps are cold light sources.
    LED energy is conserved. In addition to being converted into visible light, excess energy will be dissipated in other ways.
  2. The difference in the form of excess energy dissipation: Metal halide lamps dissipate excess energy through infrared and ultraviolet rays, but infrared rays and ultraviolet rays will affect product quality and have an impact on human physiology;
    LED lights generate heat through the light source device, losing excess energy, and heat conduction is easily controlled.
  3. The difference in lamp shell temperature: The lamp shell temperature of metal halide lamps is very high, which can exceed 130 degrees;
    The temperature of the LED lamp casing is extremely low, normally below 75 degrees. The decrease in LED casing temperature can greatly increase the safety and lifespan of cables, wires, supporting appliances, etc.
  4. Differences in vibration resistance: The filaments and bulbs of metal halide lamps are easily damaged and have poor vibration resistance;
    The light source of LED lights is electronic components, which are inherently vibration-resistant. LED lamps have unparalleled advantages in vibration resistance.
  5. The difference in light distribution performance: The light distribution performance of metal halide lamps is difficult, wasteful, and the light spot is uneven. It requires a large reflector and a large lamp body;
    LED light is extremely easy to control and can achieve a variety of light distributions in the same volume with uniform light spots. The convenient light distribution of LED can greatly save the waste of lamps in light distribution and improve the system light efficiency of lamps.
  6. Differences in resistance to grid voltage interference: Metal halide lamps: Poor, the power of the lamp changes with grid voltage fluctuations, and it is easy to be overloaded;
    LED lights: Stable, constant current power drive can keep the light source power constant when the grid voltage fluctuates. LED lamps can work normally during grid voltage fluctuations from 90-265 volts, and have no impact on the life of the light source and lamps.

Mondial is a professional lighting company that has been established for more than ten years and has a very professional sales and technical team.If you have more questions about LED drivers that you would like to discuss, please contact us. Looking forward to communicating with you.

Similar Posts