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LED Ghosting (Read 485 times)
Flashbang
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LED Ghosting
May 18th, 2023, 2:43pm
 
Using a dimmer and LED lamps I often find the LED lamps produce so called 'Ghosting' when Off. i.e. they glow slightly.  Today, my 25watt LED R7s tube arrived and was fitted to a Daughter and Child floor standing up lighter in place of the 150watt Halogen tube, in an attempt to save energy/money! But LED ghosting occurred. The same happened when I replaced two parallel wired ceiling light lamp fittings with LED lamps instead of the 6 x 40 watt filament lamps. Here I have had to replace one LED lamp in each fitting with a standard filament lamp, which immediately stopped the ghosting effect. See topic herehttps://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1646071303

It seems there are two fixes 1) Use a dimmer with neutral capacity or 2) Fit a special capacitor across the load. But this means several capacitors would be needed - one for each light fitting!  These are not cheap either.

Question...Is it a case now in the UK that having a neutral at the wall switch is a common wiring practice? I have always seen and used loop in wiring at the ceiling rose with just line and switched line being at the wall switch.  To add a neutral and a specal dimmer would involve a lot of work rewiring, chasing walls and the special dimmer costs!  Hardly any saving then!!  Angry

Or am I missing something??
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Lectrician
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Braunton, North Devon, United Kingdom
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Re: LED Ghosting
Reply #1 - Jul 21st, 2023, 5:40pm
 
Decent branded light bulbs won’t glow.  Cheaper ones can.  The capacitor snubbers don’t need to go every fitting, just one per switch.
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