Usually there are four classifications: First light tube luminous color points. Luminous tube lighting color points, can be divided into red, orange, green (also broken down yellow-green, standard green and pure green), blue, etc.. Second, the light emitting tube glossy characteristics. Light tube glossy feature cyclotomic lights, side lights, rectangular surface emitting tube, lateral pipe, surface mounting miniature tubes. Three stars by the structure of the light emitting diode. Divided wholly epoxy encapsulation, metal base epoxy encapsulated, ceramic base epoxy encapsulation and glass packaging structure according to the structure of the light-emitting diode. Fourth luminous intensity and working current. Ordinary brightness LED luminous intensity and working current; ultra-high brightness LED (light emitting intensity> 100mcd); high-brightness light-emitting diode (luminous intensity at 10 ~ 100mcd). General LED operating current 10 mA to tens of mA, low current LED current below 2mA (the same as with ordinary light-emitting tube).