1. LED light according to the luminous color of the luminous tube
According to the color of the luminous tube, it can be divided into red, orange, green (also subdivided into yellow-green, standard green and pure green), blue light and so on. In addition, some LEDs contain chips of two or three colors.
The light-emitting diodes of the above various colors can be classified into four types of colored transparent, colorless transparent, colored scattering and colorless scattering according to whether the light-emitting diode is doped with or without a scattering agent, colored or colorless. Scatter-type LEDs are used for indicator lights.
2. LED lamp according to the characteristics of the light-emitting surface of the light-emitting tube
According to the characteristics of the light-emitting surface of the light-emitting tube, the round lamp, the square lamp, the rectangular, the surface light-emitting tube, the lateral tube, the surface-mounted micro tube, and the like. The circular lamps are divided into φ2mm, φ4.4mm, φ5mm, φ8mm, φ10mm, and φ20mm according to the diameter. In foreign countries, a φ3 mm light-emitting diode is generally referred to as T-1; φ5 mm is referred to as T-1 (3/4); and φ4.4 mm is referred to as T-1 (1/4).
The angular distribution of the circular luminous intensity can be estimated from the half value angle size. There are three types from the angular distribution of luminous intensity:
(1) High directivity. It is usually a pointed epoxy package or a metal reflective cavity package with no scattering agent. The half-value angle is 5°-20° or less, has high directivity, can be used as a local illumination source, or combined with a light detector to form an automatic detection system.
(2) Standard type. Usually used as indicator light, its half value angle is 20 ° ~ 45 °.
(3) Scattering type. This is an indicator light with a large viewing angle, the half value angle is 45° to 90° or more, and the amount of the scattering agent is large.
3. According to the structure of the light-emitting diode
According to the structure of the light-emitting diode, there are structures such as a full epoxy encapsulation, a metal base epoxy package, a ceramic base epoxy package, and a glass package.
4. According to luminous intensity and working current
LEDs with ordinary brightness according to luminous intensity and working current (lighting intensity 100mcd); high-intensity light-emitting diodes with luminous intensity between 10 and 100mcd. Generally, the operating current of LEDs is between ten mA and tens of mA, while the operating current of low-current LEDs is below 2 mA (the brightness is the same as that of ordinary LEDs).
In addition to the above classification methods, there are methods for classifying by chip material and classifying by function.
With the development of LEDs in the 1960s, after decades of development, many and many types have been developed. The mainstream categories are:
1) LED (Light emitting diode): We have it called LAMP LED products , there are also called P2 products, also called its plug-in LED, no matter how long it is in-line type. There are many types of LED types:
According to the shape of the colloid: 3mm, 4mm, 5mm, 8mm, 10mm, 12mm, square, oval, tombstone, and some special shapes, etc.;
According to the colloid color: colorless transparent, colored transparent, colored scattering, colorless scattering, etc.;
By color: red, orange, yellow, green yellow, green, blue green, blue, pink, ultraviolet (uv), white (white), infrared, etc.
2) SMD (Suface mount device): Surface mount diodes or surface mount components are his name, there are many categories in this:
According to the shape and size: 0603, 0805, 1210, 5060, 1010, etc., generally smd is diamond-shaped, so the name is called according to the size of the length * width, the industry is good to use inches, not millimeters, Also useful in millimeters, not as good as 1608 (1.6 * 0.8mm).
The type of illuminating color and colloid is the same as that of LED products, except that the shape of the product has changed a lot.
3)Fish squid (Flux led): This is because the luminous efficiency of LED can not meet the requirements of automotive use, so this product was developed, it is a low-power product, its driving current is generally 50MA, 20MA for general LED, the highest current Can reach 70mA, because its heat dissipation is better, generally used in the rear taillights of cars.
4). Power led: LED products for existing lighting, which have the following classifications:
According to the power points: 1w, 3w, 5w, etc. according to the top illuminating lens points: flat head, concentrating, wine cup shape, etc. according to the process of aluminum substrate and anti-luminous.
5). Digital display (Display): used for display and digital display
According to the shape: 1 position, 2 position, 3 position, 4 position, etc. Surface color: gray surface vinyl, black plastic white, etc. Polarity: common shade, common Yang color can also do many kinds like LED .
6). Dot Matrix (LED Dot Matrix): This product is similar to the digital tube, and is applied to the information display. The pitch and the diameter of the hole are different products. Now it is generally divided into 5*7 and 8*8, and its color is monochromatic, two-color, three-primary, and the like.
According to the color: single red, single green, double primary color, three primary colors, etc.;
According to the diameter of the hole: Φ2.0, Φ3.0, Φ3.75, Φ5.0, etc.;
According to the number of points: 5*7, 8*8, 16*16, etc. There are some other products: such as cluster, LED Side Light Source, infrared receiving and emitting products (Infrared & PhotoDiode), etc. Wait.
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