According to the luminous color of the luminous tubeAccording to the luminous color of the luminous tube, it can be divided into red, orange, green (
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 (subdivided into yellow-green, standard green and pure green), blue light, etc. In addition, some light-emitting diodes contain chips of two or three colors.
According to the light-emitting diodes doped or not doped with scattering agents, 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. Scattering type light-emitting diodes are used as indicator lights.
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, φ3mm light-emitting diodes are usually referred to as T-1; φ5mm is referred to as T-1 (3/4); φ4.4mm is denoted as T-1 (1/4).
The angular distribution of circular luminous intensity can be estimated from the half-value angle. From the angular distribution of luminous intensity, there are three categories:
(1) High directivity. Generally, it is packaged with a pointed epoxy or packaged with a metal reflective cavity, and no scattering agent is added. The half-value angle is 5°-20° or less, with high directivity. It can be used as a local lighting 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°～90° or more, and the amount of scattering agent is larger.