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Can the Arduino be hurt to putby connecting too many ledsLEDs in serial?

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Can the Arduino be hurt to put too many leds in serial?

Today I learned about Vf for leds, after founding out that 3 leds in series driven by 5 V did not make them light up while 2 did.

However, I also read that it is quite bad for a power source to use more volts (like 3 times 2V) this way than the power source (5V for the Uno).

Can the Arduino be hurt this way?