LED light – emitting diodes how to classify
1. According to LED luminous color pointsAccording to LED luminous color points, can be divided into red, orange, green (and subdivided yellow green, standard green and pure green), blue and so on. In addition, some light-emitting diodes containing two or three colors of the chip. According to the light-emitting diode at the light doped or not doped with scattering agent, colored or colorless, the various colors of light-emitting diodes can be divided into colored transparent, colorless transparent, colored scattering and colorless scattering four types. Scattering-type light-emitting diodes and up to do with the light.2. According to the luminous characteristics of luminous pointsAccording to the luminous characteristics of luminous tube sub-round lights, square lights, rectangular, surface LED, lateral tube, surface mount with micro-tubes.Round lamp is divided into diameter φ2mm, φ4.4mm, φ5mm, φ8mm, φ10mm and φ20mm and so on. Foreign countries usually φ3mm light-emitting diodes as T-1; the φ5mm written as T-1 (3 4); the φ4.4mm written as T-1 (1 4). The angular distribution of the circular luminous intensity can be estimated from the half-value angular magnitude. There are three types of luminous intensity distribution:(1) High directivity. Generally pointed epoxy package, or with a metal reflective cavity package, and without scattering agent. Half-value angle of 5 ° ~ 20 ° or less, with high directivity, can be used for local lighting, or in conjunction with the optical detector to form an automatic detection system.(2) standard type. Usually used as a light, the half-value angle of 20 ° ~ 45 °.(3) scattering type. This is a larger angle of view indicator, half-value angle of 45 ° ~ 90 ° or more, the larger the amount of scattering agent.