120 LED 5mm, 20 each of green red orange yellow white blue
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6-Color 5mm LED Assortment. 120 LEDs in 6 different colors:
20 x green LED 5mm
20 x red LED 5mm
20 x yellow LED 5mm
20 x white LED 5mm
20 x blue LED 5mm
20 x orange LED 5mm
Max. current (continuous) is 20mA, resulting in 2-3V forward voltage, depending on the color.
LEDs are operated at constant current, not voltage! It is necessary, to limit the LED forward current with a resistor. The value of the resistor is easy to calculate following Ohm’s law: R = U / I
For example, a red LED with 10mA forward current at 2.2V, on a 12V power supply:
U = 12-2.2= 9.8V
I = 0.01A
R = 980 Ohm (for medium brightness)
For battery operated applications, you should consider a much lower LED current, for example 3-5mA.
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