658 Optoelectronics

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Lamps are lighting devices that are used to produce light from electricity, and are found in numerous styles, sizes and colors. They come in various materials and shapes, ranging from the most popular being incandescents and neon tubes. From a functional stand-point, all lamps have a 1. Basics such as socket, 2. Electricity supplied by mains, 3. Final light produced.

Incandescent Lights

The incandescent lamp is the best-known example of an artificial light source and they are made of a tungsten filament, enclosed in an evacuated glass envelope, similar to a vacuum. When electricity is conducted through the filament, the filament emits light in the form of heat. It is converted to visible light when the temperature of the filament is raised to a high enough level. As a result, incandescent devices produces a soft glow of subtle white light that’s much more pleasant to the eye when compared to artificial lighting such as LED. Nevertheless, this style of lighting is considered to be relatively inefficient, producing more waste heat than light output.

Neon Lights

Neon lights are a type of discharge tube which contains a noble gas or a mix of such gases (usually neon or argon). While electricity flows through the tube, it illuminates it with a bright light. Neon lights generate light through electric current passing through the gas, usually neon or a mixture of gases. This type of lighting is quite efficient, and can be found in various shapes and sizes. One of the most common types of neon lights are the neon sign-boards commonly seen on the streets and in shopping malls.

658 application field and working principle

658 is a type of light-emitting diode (LED), and it is one of the most popular LED lights. It has a wide range of application fields and can be used as a light source in a variety of applications such as general lighting, domestic appliances, automotive, toys and so on. It offers low power consumption, small size, low heat production and good color characteristics which make it a great lighting source. Its radiation pattern is also wide, producing a uniform light output both on the horizontal and vertical planes.

A 658 LED consists of a positive anode, a negative cathode and a light-emitting region (LER), encased in a hard capsule, usually made of plastic, glass or sapphire. The LED works by injecting electrons into the LER when a voltage is applied across the anode and cathode. When these electrons and electron holes within the LER meet, they combine and release energy in the form of photons, which is then converted into visible light. The color tint of the light is a result of the type of material used in the LER.

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