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Ask The Trades › DIY Forum › Electrical Questions › LED lamps glow when dimmer is Off

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LED lamps glow when dimmer is Off (Read 1936 times)

Flashbang

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LED lamps glow when dimmer is Off
Feb 28^th, 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 Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: LED lamps glow when dimmer is Off Reply #1 - Feb 28^th, 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 1^st, 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 Full Member Offline Ask The Trades Posts: 343 Total Thanks: 9 For This Post: 0 Swindon United Kingdom	Re: LED lamps glow when dimmer is Off Reply #3 - Mar 1^st, 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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Re: LED lamps glow when dimmer is Off
Reply #4 - Mar 2^nd, 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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