Mains LED light bulb flickers when switched off

We have LED bulbs in our apartment. In the bathroom, the bulb flickers on and off when it's switched off. Same when it was a CFL bulb before I switched to LED cause I hate CFLs. Our mains voltage is 220v. The bulb we have looks like this

If I remember correctly, I should add a capacitor in series to the bulb to fix this. But what kind of capacitor? and what rating?

Update:

• The switch is a combined switch and plug in one part. Looks like a normal one line switch.


• This apartment and the whole building doesn't have grounding. We don't have this in requirement in our building codes. I'm in Lebanon.


• Only this one bulb in the apartment does this. Other bulbs are also LED and two more CFL not changed yet.

Any help appreciated, thanks.

Resolution: I fixed it with an incandescent bulb! I'm too lazy to go electrician detective for now.

Answer

You might find that a different brand of bulb is much less prone to this kind of behavior. The internal circuit varies quite a bit from bulb to bulb. If you have a store with a generous return policy that applies to such products you could simply buy a few different types and try them. In particular, I would expect bulbs based on Microchip's CL8800 to not suffer from this problem. See this excellect article if you are interested in the gory details. Most bulbs have a small switching supply in them, but this type is different.