AZ Nomad wrote:
On Sun, 05 Apr 2009 16:20:03 -0400, Percival P. Cassidy wrote:
I replaced some existing incandescent bulbs by LED bulbs, then noticed
that they do not switch off completely but still glow dimly.

Checking the voltage at the lamp socket with a high-resistance
electronic multimeter, I get a reading of 48v!! A few volts might be OK
-- induction, stray voltages, etc., but 48V!!!

48V at high impedance means absolutely nothing.
Except to make LEDs glow dimly when the
switch is off!