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{"cards":[{"_id":"26717233c3ffb547c8000032","treeId":"26717244c3ffb547c8000030","seq":23037881,"position":1,"parentId":null,"content":"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.\n\nCommon-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\nCommon-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\n\n<hr style=\"border:1px solid;\">\n\n<a href=\"https://gingkoapp.com/the-light-source-with-ra-100-value.html\" style=\"color: #333;\">The light source with Ra 100 value</a>\n<a href=\"https://gingkoapp.com/the-standby-led-lighting-of-emergency.html\" style=\"color: #333;\">The standby LED lighting of emergency</a>\n<a href=\"https://gingkoapp.com/led-light-source-index-and-average-life.html\" style=\"color: #333;\">LED light source index and average life</a>\n<a href=\"https://gingkoapp.com/led-incandescent-lamp-color-response.html\" style=\"color: #333;\">LED incandescent lamp color response</a>\n<a href=\"https://gingkoapp.com/color-performance-of-led-light-source.html\" style=\"color: #333;\">Color performance of LED light source</a>\n<a href=\"https://gingkoapp.com/color-temperature-led-source-irradiation.html\" style=\"color: #333;\">Color temperature LED source irradiation</a>\n<a href=\"https://gingkoapp.com/change-the-brightness-of-the-led.html\" style=\"color: #333;\">Change the brightness of the LED</a>\n<a href=\"https://gingkoapp.com/led-chips-provide-control-voltage-interface.html\" style=\"color: #333;\">LED chips provide control voltage interface</a>\n<a href=\"https://gingkoapp.com/in-the-rgb-led-system.html\" style=\"color: #333;\">In the RGB LED system</a>\n<a href=\"https://gingkoapp.com/led-supply-voltage-and-load-voltage.html\" style=\"color: #333;\">LED supply voltage and load voltage</a>"}],"tree":{"_id":"26717244c3ffb547c8000030","name":"LED chips provide control voltage interface","publicUrl":"led-chips-provide-control-voltage-interface"}}