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Led voltages Answered

I have a small pile of salvaged LEDs from various burned up electronics (flashlights, old stereos, etc) and I am wondering if there is any way to figure out what the voltage requirements are for the led. if anyone has an idea how to find this out it would be of great help.

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just google led color voltage I'm tired of posting the voltages for leds like every week to give you a hint red is usually 1.7