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LED lamps glow when dimmer is Off (Read 162 times)
Flashbang
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LED lamps glow when dimmer is Off
Feb 28th, 2022, 6:01pm
 
Hi all
I have two three lamp ceiling light fittings controlled by one dimmer switch.  Each fitting has three LED lamps (6 in all).  I changed the dimmer switch for a LED dimmer switch which is also Alexa controlled Here ... https://www.amazon.co.uk/gp/product/B091HP42S8/ref=ppx_yo_dt_b_asin_title_o00_s0...
But when Off the LED lamps all glow very slightly.   I believe this is caused by inductance occurring between the live and switched live wires between the light fittings and the dimmer switch?
I understand that fitting a Bypass (Capacitor?) across Sw Live and Neutral in the first light fitting will stop this glow, But what capacitor?- Type make etc would be very helpful or an alternative suggestion?  UK based.
 
Thanks in anticipation
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Lectrician
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Re: LED lamps glow when dimmer is Off
Reply #1 - Feb 28th, 2022, 6:52pm
 
Most dimmers these days, especially if designed for LED, will not cause the lamps to glow.  That said, things like PIR detectors can.  Danlers do this:

https://www.tlc-direct.co.uk/Products/DNCAPLOAD.html

...

I have used this on some dodgy dimmers.
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Flashbang
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Re: LED lamps glow when dimmer is Off
Reply #2 - Mar 1st, 2022, 12:50pm
 
Hi

Thanks for the link etc. I had seen those before, but understood (wrongly?) they were for specific use with Danlers products - Dimmers etc.
Last evening I replaced one LED lamp with a conventional 40watt filament lamp and the flickering/ glowing ceased immediately which points to the induced voltage in the switch line to the light fittings
Annoyingly the six LED 5watt lamps were not cheap nor was the trailing edge dimmer.  Embarrassed
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Natedog
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Re: LED lamps glow when dimmer is Off
Reply #3 - Mar 1st, 2022, 10:15pm
 
What bulbs are you using?  Decent LED bulbs normally would have a fairly high value resistor across the input to stop the dim glow, in the same way your filament bulb (basically just a resistive load) is doing
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Flashbang
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Re: LED lamps glow when dimmer is Off
Reply #4 - Mar 2nd, 2022, 10:35am
 
Hi
The six LED 5watt Golf ball lamps are all from a company called Ahead renewable energy. A British company it says on the lamps box located in Theale, Berkshire!  But made in PRC which I take to be Peoples Republic of China?  Perhaps they are not the best after all? Box states they are dimmable.  None the less, any lamp purchased should work as expected - correctly!  Otherwise they are not fit for purpose.  Huh
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