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Answer: Yes, polarized, Bi-polar, diode and resistor LED circuits and or LED clusters/lamps are Dimmable.
With Voltage reduction LEDs dim almost linearly as opposed to faster drop in intensity like Incandescent lamps. Important thing to remember is that all LEDs have a Turn-On Voltage. This is the voltage that will start the minimal flow of Current through the LED. A single chip Red (R3K), SP Red (E3K), Orange (O3K), Yellow (Y3K) and Lime Green (G1K) are typically 2Vf at 20mA but Turn -On voltage of these LEDs is somewhere between1.6Vf to 1.7Vf at 1mA. That means a single LED will dim linearly down to 1.6Vf to 1.7Vf and then turn off. In LED Clusters, the Turn-Off voltage depends on how many LEDs are connected in Series or how many LEDs you have on one circuit. LEDs can be dimmed with Potentiometers. The resistor value has to be based on the LED and or LED cluster. In the electronics industry, dimming is achieved by varying Pulse and Duty Cycles of the input voltage.
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