| Try applying 2.5V to an LED that requires 2.5V and 70mA without a limiting resistor The resistor is NOT A GOOD WAY to determine how bright you want the LED to shine. Going too small a resistor can allow the LED to exceed the maximum forward current it can handle. Now if you have multiple LEDs side by side, and you want them to maintain a consistent intensity and output based on the current consumption, a larger resistor will not allow this to happen. When it drops below its ideal forward current, the LEDs do not dim in a linear fashion. Some will go cold sooner than others. To get the ideal for brightness, you ALWAYS run it at it's ideal forward voltage, however you include a Timer circuit. Some people in the lighting world know it as a Pulse width Modulator but it is as simple as a 555 timer behind a Power Transistor. To get the ideal resistor for the manufacturers stated ideal forward current is Ohms Law.... E=I*R
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