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Yes, it is energy storage. the cable forms a small capacitor, and this allows a small current to flow into the lamp itself.
Oops. How do I make the GIF bigger?
There is a slightly more technical solution for those in the USA that have a bi-phase 110/220 volt main.The reverse phase can be fed to the lamp via a capacitor of equal capacitance to that of the switch cable neutrolising the effect.Make sure the capacitor can withstand 220v or there may be a bang
Actually it's no more disturbing than the flashing LED on a smoke detector. I was really just curious as to the cause.