According to the distribution map, SMD LED is divided into (1) high directionality. Generally, it is a pointed epoxy packaging or a packaging with a metal reflection cavity, without adding a scattering agent. The half value angle is 5 20. Or smaller, the rectifier bridge has high directionality and can be used as a partial lighting source, or combined with a light detector to form an automatic detection system. (2) Standard type. Generally used as an indicator light, with a half value angle of 20 45. (3) Scattering type. This is an indicator light with a larger viewing angle, with a half angle of 45 90. Or larger, with a larger amount of scattering agent. Chip mounted LEDs have general brightness based on current, luminous intensity, and operating current (luminous intensity 100mcd); A high brightness LED with a luminous intensity between 10 and 100mcd is called a high brightness LED. The operating current of general SMD LED ranges from tens of mA to tens of mA, while the operating current of low current D is below 2mA. SMD LED has the advantages of small volume, low power consumption, long service life, high brightness, environmental protection, durability and reliability, suitable for mass production, fast response, shockproof, energy-saving, high resolution, shockproof, and programmable.

(1) High directionality. Generally, it is a pointed epoxy packaging or a packaging with a metal reflection cavity, without adding a scattering agent. The half value angle is 5 20. Or smaller, the rectifier bridge has high directionality and can be used as a partial lighting source, or combined with a light detector to form an automatic detection system.

(2) Standard type. Generally used as an indicator light, with a half value angle of 20 45.

(3) Scattering type. This is an indicator light with a larger viewing angle, with a half angle of 45 90. Or larger, with a larger amount of scattering agent.