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Classification of LED

  1 according to the luminous color

  According to the luminous tube color, can be divided into red, orange, green (and subdivided into yellow green, standard green and pure green), Blu ray, etc.. In addition, some LEDs contain two or three color chips.

  According to the light emitting diode with or without light scattering agent, colored or colorless, the various colors of light-emitting diodes can also be divided into colored transparent, colorless transparent, colored scattering and colorless scattering of four types. A light emitting diode and a light emitting diode.

  2 according to the characteristics of light emitting tube

  According to the characteristics of the light outlet of the light emitting tube, the utility model is characterized in that a circular lamp, a square lamp, a rectangle, a surface luminous tube, a side pipe, a micro tube for surface mounting, etc.. According to the diameter of the circular lamp is divided into Phi 2mm, Phi 4.4mm, Phi 5mm, Phi 8mm, Phi 10mm and phi 20mm. Foreign usually put the 3mm light emitting diode as T-1; the phi 5mm for T-1 (3/4); the phi 4.4mm as T-1 (1/4).

  The angular distribution of circular luminous intensity can be estimated from the angle of half value. From the distribution of luminous intensity angle to divide into three categories:

  (1) high directivity. Generally, it is a pointed epoxy package, or a metal reflection cavity package, and no scattering agent. Half value angle of 5 degrees - 20 degrees or less, with high directivity, can be used as a local lighting source, or with the light detector to form an automatic detection system.

  (2) standard type. Usually used as indicator, the half value angle of 20 degrees - 45 degrees.

  (3) scattering type. This is a larger viewing angle, half the value of the angle of 45 degrees - 90 degrees or greater, the greater the amount of scattering agent.

  3 according to the structure of light-emitting diodes

  According to the structure of the light-emitting diode is divided into epoxy encapsulation, metal base epoxy encapsulation, ceramic base epoxy packaging and glass packaging structure.

  4 according to the luminous intensity and working current

  According to the luminous intensity and working current is divided into ordinary brightness LED (luminous intensity <10mcd); ultra high brightness LED (luminous intensity >100mcd); the luminous intensity between 10 - 100mcd is called high brightness led.

  General LED operating current in more than a dozen mA to tens of mA, while the low current LED operating current below 2mA (brightness and the same as the ordinary light-emitting tube).

  In addition to the above classification methods, there are also classified and classified according to the function of the chip material.