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Topic Title: low energy bulbs, strange behaviour
Topic Summary: Flickering when "off"
Created On: 14 July 2008 07:26 PM
Status: Read Only
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 21 November 2009 09:08 PM
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I wonder if an insulation test on the circuit would reveal where the problem is

Chris Matheson MInstMC
 12 July 2011 02:51 PM
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I have recently noticed this phenomenon after switching to a high watt low energy bulb. I had assumed it was due to the bulb flickering as it was cooling down, but after reading this thread I checked the wiring and found that there is a very weak current in the switching circuit even when it is "off". It is not enough to affect most light bulbs but it causes certain types of low energy bulbs to emit a weak flash about every 5 seconds. It is not noticeable during daylight unless you are really looking for it. I assume it is due to some sort of induced current. If it gets too annoying I guess you can always use a different type of bulb.
 20 May 2012 03:13 PM
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Just to let you know, the LED lamps also flicker in the same way.
I have just replaced a low energey lamp, which was flickering, in my bathroom with an LED one, and got the same problem.
Fitting a small snubber circuit in the lamp holder fixed it for me. 100nF capacitor and 100k resistor in series will do the trick. Or buy the ready made one from Maplin as posted before.
 20 August 2012 02:40 AM
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I know you didn't say anything about a dimmer switch, but I had a compact florescent light in a dimmer switch and when you dimmed it completely, it would flicker in such a matter. You must have CFL bulbs designed for a dimmer switch, if this is the case.
IET » Consumer technology » low energy bulbs, strange behaviour

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