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Posted by Bob F on August 29, 2007, 11:00 am
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>>I think there's a ghost in my house.
>> Sitting in the dark, I occasionally witness a compact flourescent bulb
>> light up very faintly, for no more than a second. Two lights (on two
>> different circuits) do this.
> Other posters have correctly identified induced voltage as the most likely
> cause.
> With some CFL electronic ballast designs, this voltage will slowly charge a
> filter capacitor inside the CFL until it reaches a critical threshold, at
> which point the lamp will flash on momentarily.
> The voltage may be due to the design of the 3/4 way switches, so you can try
> changing these to a different design. Or change the CFL to one that has a
> different ballast (e.g., quick-start vs. not-quick-start).
Or put one small incandesent bulb on the circuit.
Bob
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>> Sitting in the dark, I occasionally witness a compact flourescent bulb
>> light up very faintly, for no more than a second. Two lights (on two
>> different circuits) do this.
> Other posters have correctly identified induced voltage as the most likely
> cause.
> With some CFL electronic ballast designs, this voltage will slowly charge a
> filter capacitor inside the CFL until it reaches a critical threshold, at
> which point the lamp will flash on momentarily.
> The voltage may be due to the design of the 3/4 way switches, so you can try
> changing these to a different design. Or change the CFL to one that has a
> different ballast (e.g., quick-start vs. not-quick-start).