If heat isn't a problem, use a resistor

I've run LEDs directly from 240VAC using a current-limiting
capacitor as the main dropper and a signal diode reverse-
paralleled with the LED

At 50Hz, 1uF will pass ~ 70mA

Google led ac images

There's also this, for strings

http://home.clear.net.nz/pages/joecolquitt/acwhiteleds.pdf

Joe
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