
The Power supply needs to be greater then the forward voltage plusan extra minimum of two more volts. Six or nine volts are favorite values.
You must plan to put a resistor in series with the LED.
Pay attention, not to exceed the recommended LED current,
or the longevity will be cut down fast !https://upload.wikimedia.org/wikipedia/commons/a/a5/Diode-IV-Curve.svg

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