How to judge the quality of high power LED patch LED?
The normal forward resistance shall be less than 30K ohm, and the reverse resistance shall be greater than 1M ohm. If the positive and negative resistances are zero, the internal breakdown is short circuited. If the positive and negative resistances are infinite, the internal circuit is proved to be open.
1, for the same material, the tube core, due to different impurities doped, the color of the light is also different2, LED belongs to the current control device, the VF varies with the IF, the standard VF value is for reference only
The positive and negative electrodes of the LED can also be distinguished according to the shape. Early production pipe with a metal tube, covered by an optical lens, a projection tube side, close to the projection is positive. The LED currently produced are all encapsulated in a transparent or semi transparent epoxy resin and form a lens with an epoxy resin that acts as an amplifying and focusing device.
The LED has a single conductor electrical property. The positive and reverse resistances can be measured by using the R * 10K file.
