If an AC voltage within the limits of the LED is applied, is another
rectifier is needed, since the LED will rectify. It's reverse voltage
is limited so the AC probably must be a few volts. See if any vendors
of LEDs provide the reverse voltage limit. Select a capacitor with
impedance to limit the current to a desired value. A pot can be added
for control. I haven't tested this, but believe it will work fine.
I've used red LEDs, about 2 volts drop each, in strings of 5 from a 12
VDC battery with a 5 or 10 K Ohm pot for control in my observatory for a
few years with no problem and very good range of light intensity.
73, WO0W
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