HIDs or High-Intensity Discharge Lamps are the most common light-emitting devices in electronics. Major automobile companies, security systems, machines, and even most households light their surroundings using these lamps. They are very simple in their construct and quite affordable. Both these attract many buyers to this age-old product.
However, just like any other product, HIDs have their shortcomings. The major shortcoming is the phenomenon of dimming of light after a long period of usage. Another one is that more electric power is exhausted in comparison to the light manifested.
The latter was, however, resolved after the latest reforms in the device. In the topic below, we are going to learn more about these highly useful lamps.
HIDs can be described as lamps working on electrical gas-discharge concepts. These emit light with the help of electrical filaments fitted inside them. The basics of an HID design can be described in the following way.
An electric arc made up of a suitable metal is held by two tungsten electrodes within a translucent, preferably transparent tube. The tube is made up of fused quartz and filled with a noble gas.Considering the wide usage of HIDs in various fields of science and its applications, various types of these lamps are available in the market. These types widely differ in the basic attributes of efficiency, light intensity, life span, etc. Some of the major types of HIDs can be listed as below:
â— Sodium-vapor lamps
They are very efficient in functioning and give off a yellow-orange light. When the pressure in them is higher, the light being emitted turns whiter.
â— Xenon short-arc lamps
These are not very common in usage. Light is produced in an ionized Xenon environment.
â— Mercury vapor lamps
They were the first of all commercial HIDs and used to produce bluish green-tinted light back in the day.
â— Metal halide lamps and ceramic metal halide lamps
These two kinds of lamps are used to give off white light for common household purposes. They are quite commonly used.
Now that we have discussed the design involved in a High-Intensity Discharge Lamp, let us go forth with its working. In the figure below, you can see the construct of a basic HID. For this explanation let us consider an HID as shown in the figure below. Here in the image, we can see a glass tube that houses an electrical arc standing between two tungsten electrodes. Noble gas is encapsulated inside the glass tube and that enables the primary spark needed to light up the arc.
The working of an HID can be explained in the following way. Having been supplied with the required amount of electricity, the filament gets charged up. This inflow of charge in the arc causes the surrounding gas to get ionized and hence emit high-intensity light. The light emitted is in the visible light range only. The functioning of HIDs is similar to that of fluorescent lamps.
Applications of HIDs
HID or High-Intensity Discharge Lamps find their usage in the fields which require the availability of bright light with a very large coverage area being illuminated. HIDs are also used in matters that have a huge focus on the intensity of delivered light and the electrical efficiency of the lamp.
Considering the attributes that they serve, HIDs find their usage in the following areas:
â— HIDs are widely used to light up sports stadiums and stages as they give out a very bright light with amazing electrical efficiency.
â— Due to the electrical efficiency, HIDs make up for a cost-effective option in households.
â— Lately, they have also found their usage in projection and television devices. â— In addition to all these, HID headlights are widely in use in various kinds of vehicles.
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