First, the LED light is divided 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 (subdivided into yellow-green, standard green and pure green), blue light and so on. In addition, some light-emitting diodes include 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.
Second, the LED light is divided 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 light-emitting diode of φ3 mm is generally referred to as T-1; a φ5 mm is referred to as T-1 (3/4); and a 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 categories from the angular distribution of luminous intensity:
(1) High directivity. It is usually a tip epoxy package or a metal reflector package with no scattering agent. The half value angle is 5 ° ~ 20 ° or less, has a 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.
Third, 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 the 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 the LED is between ten mA and several tens of mA, and the operating current of the low current LED is below 2 mA (the brightness is the same as that of the ordinary luminous tube).