This detection resistance value is usually very small, only a few tenths of a ohm, if you want to install a few tenths of a ohm potentiometer on the wall to adjust the current is not possible, because the lead resistance will also be a few tenths of a ohm. So some LED chips provide a control voltage interface, change the input control voltage can change its output constant current value. The problem with using forward current to adjust brightness is that it also changes the spectrum and color temperature. Because white LED is generated by using blue LED to stimulate yellow phosphor, when the forward current decreases, the brightness of blue LED increases while the thickness of yellow phosphor does not decrease proportionally, so that the main wavelength of its spectrum increases.

Common-Cathode CC <a href="http://www.lanpade.com/7-segment-led-dot-matrix/3022agg.html" style="color: #333;">3022AGG</a> 7-Segment digit <a href="http://www.xlitx.com/datasheet/3022AGG.pdf" style="color: #333;">3022AGG</a> LED Common-Anode CA <a href="http://www.lanpade.com/7-segment-led-dot-matrix/3022bgg.html" style="color: #333;">3022BGG</a> Display <a href="http://www.xlitx.com/datasheet/3022BGG.pdf" style="color: #333;">3022BGG</a> 0.30 inch
Common-Cathode CC <a href="http://www.lanpade.com/7-segment-led-dot-matrix/3202agg.html" style="color: #333;">3202AGG</a> 7-Segment digit <a href="http://www.xlitx.com/datasheet/3202AGG.pdf" style="color: #333;">3202AGG</a> LED Common-Anode CA <a href="http://www.lanpade.com/7-segment-led-dot-matrix/3202bgg.html" style="color: #333;">3202BGG</a> Display <a href="http://www.xlitx.com/datasheet/3202BGG.pdf" style="color: #333;">3202BGG</a> 0.30 inch

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