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SMD LEDs by color
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, white light and so on.
In addition, some LEDs contain chips of two or three colors, which is different from the previous ones.
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.
In general, diode manufacturers use red, green, and blue. As for the more used in lighting, it is a white LED.
According to the distribution map
(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, and the rectifier bridge 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 ° ~ 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.
By 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 working current of the chip diode 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 light-emitting tube).