1. According to the luminous color of the luminous tube
According to the luminous color of the luminous tube, it can be divided into red, orange, green, blue and so on. In addition, some light-emitting diodes contain chips of two or three colors.
According to the light emitting diode doped or not doped with a scattering agent, colored or colorless, the above-mentioned light emitting diodes of various colors can be divided into four types: colored and transparent, colorless and transparent, colored scattering and colorless scattering.
2. According to the characteristics of the light emitting surface of the luminous tube
According to the characteristics of the light emitting surface of the luminous tube, it can be divided into round lamps, square lamps, rectangular, surface luminous tubes, lateral tubes, and microtubes for surface mounting. Round lamps are divided into φ2mm, φ4.4mm, φ5mm, φ8mm, φ10mm and φ20mm according to their diameters.
In foreign countries, "T" is usually used to represent "Tube", which means the diameter of a tube tube, and the number after T means the diameter of the tube; T8 has 8 "Ts", and one "T" is 1/8 inch. 1 inch = 25.4mm. Then each "T" is 25.4÷8=3.175mm
For example, T8 tube: the diameter of T8 tube is (8/8) ×25.4=25.4mm [T8 is exactly one inch in diameter]
3. From the angular distribution of luminous intensity
(1). High directivity. Generally, it is a pointed epoxy package, or a package with a metal reflective cavity, and no scattering agent is added. The half-value angle is 5°-20° or less, with high directivity, and can be used as a local illumination light 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 larger viewing angle, the half-value angle is 45° to 90° or more, and the amount of scattering agent is larger.
4. According to the structure of light-emitting diodes
According to the structure of light-emitting diodes, there are full epoxy encapsulation, metal base epoxy encapsulation, ceramic base epoxy encapsulation, and glass encapsulation.
