2, LED lights according to the characteristics of the light-emitting surface
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 Ï†2mm, Ï†4.4mm, Ï†5mm, Ï†8mm, Ï†10mm, and Ï†20mm according to the diameter. In foreign countries, a Ï†3 mm light-emitting diode is generally referred to as T-1; Ï†5 mm is referred to as T-1 (3/4); and Ï†4.4 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 categories 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 5Â°~20Â° or less, and it has high directivity. It 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 Â° ~ 45 Â°. (3) scattering type. This is an indicator light with a large viewing angle, the half value angle is 45Â° to 90Â° or more, and the amount of the scattering agent is large.
3, according to the structure of the LED
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).
5, in addition to the above classification methods, there are also methods according to chip material classification and function classification.
With the development of LEDs in the 1960s, after many decades of development, many types have been developed. The mainstream categories are: (1) LED (Light emitting diode): We have called it LAMP LED products, Call it P2 products, there are also called plug-in LEDs, no matter how long as they are in-line type. There are many types of LED types: according to the shape of the gel: 3mm, 4mm, 5mm, 8mm, 10mm, 12mm, square, oval, tombstone, and some special shapes; etc.; according to the color of the gel: colorless and transparent , colored transparent, colored scattering, colorless scattering, etc.; by color: red, orange, yellow, green yellow, green, blue green, Blue (blue), purple (pink), ultraviolet (uv), white (white), infrared, etc.; (2) SMD (Suface mount device): surface mount diode or surface mount components are his name Law, there are many categories in this: according to the size of the shape: 0603, 0805, 1210, 5060, 1010, etc., generally smd are diamond-shaped, so the name is called according to the size of the length * width, industry good They are all in inches, not millimeters, and they are also called 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 The current can reach 70mA, because its heat dissipation is better, and it is generally used in the rear taillights of automobiles. (4) Power led: LED products with existing lighting, which have the following classifications: according to power: 1w, 3w, 5w, etc. according to the top luminous lens: flat head, spotlight, wine glass shape, etc. There are also aluminum substrates and anti-luminous. (5) Digital display (Display): The earliest used for display and digital display according to the shape: 1 position, 2 position, 3 position, 4 position, etc. Surface color: gray surface vinyl, also black surface white The polarity of the glue, etc.: common shade, common yang; color can also do many kinds of like LED. (6) 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: Î¦2.0, Î¦3.0, Î¦3.75, Î¦5.0, etc.; according to the number of points: 5 * 7, 8 * 8, 16 * 16 and so on, there are some other products: such as pixel tube ( Cluster), LED Side Light Source, Infrared & PhotoDiode, etc.
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