A halogen lamp is a special type of gas-filled incandescent lamp, with the filling gas containing a portion of halogen elements or halides. Below is a detailed introduction to halogen lamps:
1. Definition and Principle
● Definition
A halogen lamp is an incandescent lamp filled with halogen elements or halides, operating on the principle of the halogen-tungsten cycle, effectively preventing the blackening of the glass bulb caused by tungsten filament evaporation in ordinary incandescent lamps.
● Principle
Under appropriate temperature conditions, the tungsten evaporated from the filament reacts with the halogen in the bulb’s wall region, forming volatile tungsten halide compounds. These compounds become gaseous at the high temperature of the bulb wall and diffuse into the hotter region around the filament, where they decompose back into tungsten and halogen. The tungsten redeposits onto the filament, while the halogen continues to participate in the cycle.
2. Characteristics and Advantages
● High Color Rendering Index
Halogen lamps have a high color rendering index (CRI), usually greater than 95, allowing them to render object colors more accurately.
● High Efficiency
Due to the halogen-tungsten cycle, halogen lamps are highly efficient, with simple circuitry and easy use.
● Long Lifespan
Compared to ordinary incandescent lamps, halogen lamps have a longer lifespan, especially low-voltage halogen lamps, which offer enhanced longevity and safety.
● Spectral Properties
The spectral properties of halogen lamps closely resemble sunlight, with high color temperature and brightness, making them suitable for various lighting needs.
3. Classification and Applications
● Classification
Halogen lamps can be classified by use into lighting halogen lamps, automotive halogen lamps, infrared and ultraviolet irradiation halogen lamps, etc. Lighting halogen lamps can be further divided into high-pressure double-ended lamps, low-voltage single-ended lamps, and multi-plane cold reflection low-voltage directional lamps, among others.
● Applications
Due to their high brightness, high efficiency, and long lifespan, halogen lamps are widely used in fields such as household lighting and industrial inspection. Jinsp uses halogen light sources in many testing experiments and application systems.
4. Differences from Incandescent Lamps
Halogen and incandescent lamps have notable differences in several areas. Below are the main distinctions:
● Working Principle
Incandescent Lamp: Incandescent lamps are direct thermal radiators, with light produced by the resistance property of the tungsten filament. When current passes through the tungsten filament, it heats up and emits light. This method is simple but relatively inefficient.
Halogen Lamp: Halogen lamps operate using an ionized body light-emission principle and have an ignition process, falling under the category of high-pressure lamps. When operating, the tungsten atoms evaporated from the filament react with the halogen gas, forming tungsten halide. This compound moves to the center of the glass tube, where it decomposes into tungsten and halogen vapor. The tungsten redeposits onto the filament, creating a cycle. This cycle prolongs the filament’s lifespan and increases light efficiency and color temperature.
● Lifespan
Incandescent Lamp: The filament in incandescent lamps easily evaporates and breaks under high temperatures, leading to a relatively short lifespan.
Halogen Lamp: The halogen-tungsten cycle effectively prevents filament evaporation and breakage, extending the lifespan of halogen lamps. In general, halogen lamps last longer than incandescent lamps.
● Applicable Scenarios
Incandescent Lamp: Due to low cost, simple manufacturing, and good color rendering (Ra=100), incandescent lamps were widely used in household and commercial lighting in the past. However, with technological advancements, incandescent lamps are gradually being replaced by more efficient lighting products due to their low light efficiency and high energy consumption.
Halogen Lamp: Halogen lamps, with their high brightness, high color temperature, and long lifespan, are widely used in applications requiring high-quality lighting. For example, they are commonly found in automotive headlights, stage lighting, and commercial display lighting.
Post time: Sep-06-2024