Drive LED with 220 VAC
Instead of using a resistor to drop most of the voltage, you can use a properly rated capacitor.



If you use this in a device with a mains plug, add a 1 Mohm resistor in parallel with the capacitor so that it is discharged after use !

You could use a high efficiency LED so it needs less current, then you can lower the value of the capacitor to 100 nF for example.