[SOLVED] CFL lamp blinks when off

[Tipu606]

this is a 32 watts 220V ac CFL lamp
when it is switched off for the night the lamp flickers or rather blinks at regular intervals of approx 1 minute even though there is no power supply to the bulb
Can anyone please give an explanation why it is
behaving in this eerie manner at night?
thanks

 

[tpetar]

https://www.edaboard.com/threads/137924/

https://en.wikipedia.org/wiki/Compact_fluorescent_lamp

 

[Tipu606]

yes i read the post of amir81 but there is no neon indicator in my lamp switch.
Its a simple on/off switch
the lamp seems to light up for an instant then shuts off
amir81 said it was due to the large capacitor in the input stage
of the CFL circuit but how is it getting charged?
regards

 

[pranam77]

this is a 32 watts 220V ac CFL lamp when it is switched off for the night the lamp flickers or rather blinks at regular intervals of approx 1 minute even though there is no power supply to the bulb Can anyone please give an explanation why it is behaving in this eerie manner at night? thanks

Most probably as i guess the connection must have a 2 way swicth by which the bulb can be controlled by both ends, and in one position the neutra is cut off and not the phase and this usually created the said problem. Or if it has a single switch, it is probably connected to the neutral line.
Cheers

 

[tpetar]

Maybe depends what your switch switching phase or null.

 

[Tipu606]

i checked, the phase is indeed connected to the switch
@pranam77---no, there is no two way switch
The lamp was kept off all day and it did not blink at night
Only when the lamp is on all day ,it starts to blink at night
regards
EDIT:a particular brand of this energy saving lamp is showing this
blinking phenomenon
I changed to another brand and there is no more any blinking

 

[ahsan_i_h]

We can explain this phenomena in two ways. Firstly it may be only Dielectric absobtion (ref: https://en.wikipedia.org/wiki/Dielectric_absorption) or Secondly any high frequency cable is passed closely to the switch output cable, then capasitive leakage current gets rectified and gets add with dielectric absobtion. As whole day on initiate blinking, so it clearly indicates dielectric absobtion is involved.