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Does a 12v LED need a resistor?

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Does a 12v LED need a resistor?

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Some LEDs such as colour changing LEDs, flashing LEDs and 5V LEDs are designed to run off a 5V supply and therefore don't need a resistor. All other standard and bright LEDs will need a current limit resistor. ... For a standard LED the forward voltage will typically be 2V, where as an ultra bright LED will be about 3.5V.

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