LED has red, green(yellow green, pure green), orange and blue. In addition, some LED light include two or three colors chip.
And according to LED light whether doped with the scattering agent or not, colored or colorless, above various colors LED light can be classify with four types include: colored transparent, colorless transparent, colorless scattering and colorless scattering. Scattering LED are often used as indicators.
LED can be classify with circular lamp, square lamp, rectangular lamp, surface LED, side tube, surface mount micro tube etc. Then the circular lamp is divided by diameter,as Φ2mm, Φ4.4mm, Φ5mm, Φ8mm, Φ10mm and Φ20mm ,and so on. Φ3mm LED is often marked as T-1 in many country, Φ5mm LED is marked as T-1 (3/4), Φ4.4mm LED is marked as T-1 (1/4).
Due to the half angle size can estimate the circular luminous intensity.According to the Angle of LED luminous intensity can be classify with three types:
A.High directivity types. It generally is epoxy packages, orwith a metal reflective cavity, and without scattering agent. The angle of half measure is 5°~20° or even less, it has high directivity, also can be used as a partial lighting source, or combine with the detector to form an automatic test system.
B.Standard types. It is used as indicators, its half angle value can reach 20°-45° degree.
C.Scattering type. It’s a indicators with large view angle, so its half angle value reaches 45°-90°and even larger.
LED is classify with full epoxy encapsulation, metal base epoxy encapsulation, ceramic base epoxy encapsulation and glass encapsulation etc.
6.Luminous intensity and working current
LED can be classify with the ordinary brightness(luminous intensity<10mcd), high brightness(luminous intensity100mcd) and high-brightness LED (top LED).Normally its luminous intensity reaches 10〜l00mcd.
Besides the above all classification, there are other ways to classify, such as according to its chip materials and function.