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PostPosted: Sat Jan 20, 2018 5:23 pm 
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Hi all, I have just swapped the three 40w lamps in my lounge ceiling light for 6.2x LED lamps that are marked as being 'dimmable', and indeed they dim fine! However now the wall rotary dimmer switch makes a loud buzzing noise on anything other than full power, loud enough to be heard above conversation and not really acceptable. I swapped the old lamps back in, and the switch again buzzed very softly, as it has done for years! Are these lamps not really compatible with a simple dimmer swich or is mine on its way out?


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PostPosted: Sat Jan 20, 2018 6:40 pm 
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With the led's there is not enough load on the dimmer hence it buzzing - swapping the dimmer out for a "electronic" (aka trailing edge) dimmer should do the trick

there are many 100's of articles on google, some that are highly technical


edit. a Varilight V-Pro dimmer will do the job and is budget friendly at around the £15 mark



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PostPosted: Sat Jan 20, 2018 8:38 pm 
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Bob225 wrote:
With the led's there is not enough load on the dimmer hence it buzzing -


Sorry, but that is not technically true.

Wattage too low is often associated with "transformers*" in that most "transformers" have a minimum wattage and 2/3 LED lamps are not enough for the "transformer*" to work. Often people will take a out MR16 lamps (12v) and replace with 12v LED lamps and wonder why they don't work.
The loud buzzing is caused by the coil in the dimmer as it tries to switch the LED lamps, something leading edge dimmers were never designed to do.

As you (Bob225) said if the OP buys a suitable dimmer this one it is a trailing edge dimmer and works with LED lamps. (It has more components in it and does not work the same way a leading edge dimmer works) Other brands of trailing edge dimmer are available, and this one needs a 35mm back box (Most are 16mm)

* Electronic power-supply, often called a transformer.

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PostPosted: Mon Jan 22, 2018 2:56 pm 
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Thanks for the replies, can someone educate me in simple terms as to what the differences between a trailing and leading edge dimmer are?!
I should point out that the lights are controlled by a simple on/off switch next to the main door, and this dimmer at the other end of the room, will this require a particular type of dimmer?


Last edited by Molewrench on Mon Jan 22, 2018 3:39 pm, edited 1 time in total.

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PostPosted: Mon Jan 22, 2018 3:20 pm 
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It's very technical and so dull, boring and hard to understand. :-P

In a nut shell.

A.C. Is a sine wave, dimmers work by cutting off the sine wave at the right time. Trailing edge dimmers cut it off towards the end of the wave, leading edge dimmers cut it off just as the wave starts.


See, I said it was very technical, so dull and boring and hard to understand and that was the easy version. :wink:

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PostPosted: Mon Jan 22, 2018 5:05 pm 
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Actually, that wasnt so hard to understand! What about my other point, about the second switch?


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PostPosted: Mon Jan 22, 2018 7:26 pm 
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Molewrench wrote:
Actually, that wasnt so hard to understand! What about my other point, about the second switch?


Then you just have to make sure the dimmerswitch is a two way switch!

BTW The Varilight V Pro is without a doubt the best dimmerswitch I have ever worked with when dimming LEDs and it is also a two way switch.

Watch out for box depth.


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PostPosted: Mon Jan 22, 2018 8:20 pm 
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Molewrench wrote:
Actually, that wasnt so hard to understand!
Oh, I did well then.

Molewrench wrote:
What about my other point, about the second switch?


What other switch?
If you have another switch controlling the same set of lights there are some questions.

1) Is this other switch a dimmer?

2) Is this other switch a normal on/off switch


If it is a dimmer you are going to have problems as you can't use two dimmers on two way switching, it doesn't work. How ever there are a few companies that came up with a way round it. You have 1 MASTER dimmer and as many SLAVE dimmers as you like, but they all look like dimmers. (That was the idea) so if you do have this set up I don't know of a new version for LED's (Not saying there isn't one, just I don't know its name if there is one)

If the other switch is just on/off it can just stay as it is.

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PostPosted: Tue Jan 23, 2018 4:30 pm 
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Someone-else, the other switch is a simple on off job, so not an issue there.
Does the Varilight V-Pro need a deeper box than standard?


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PostPosted: Tue Jan 23, 2018 5:55 pm 
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Yes, it needs a 35mm box.

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PostPosted: Wed Jan 24, 2018 3:46 pm 
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someone-else wrote:
Yes, it needs a 35mm box.

Blimey, so now I have to dig a deeper hole in the wall and replace the box, I thought this would just be a change of the lamps and save some money on my electric bill! :cb


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PostPosted: Wed Jan 24, 2018 6:52 pm 
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The data sheet for the standard white plastic V pro says a 25mm well do. Although that will depend on how many cables are in the back box.

You could of course use a spacer if you do not want to swap the backbox at the moment.


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PostPosted: Wed Jan 24, 2018 6:58 pm 
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.........or surface mount it :lol:

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PostPosted: Sat Jan 27, 2018 4:12 pm 
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I have seen a plastic box for plasterboard walls that have two yellow lugs that open out to hold the box in place, are these any use? I am concerned that after I remove the plaster behind the existing box to deepen the hole there will not be anything to screw fix the new box into.


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PostPosted: Sat Jan 27, 2018 4:37 pm 
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Depends what is behind the existing box, I doubt its plaster.

As you said the boxes with the wings are meant for plasterboard, if yours is a brick wall, you will not need a box for plasterboard.

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Fret not, a forum is a collection of opinions. Above, are mine.

Which is correct? Metre or Meter? Click the link to find out more.

Working on anything electrical? have you got a multi meter? why not? Would you hit a nail with a shoe?

If gloom had a voice, it would be me. :mrgreen:

:idea1: How to post a picture on this forum Click here


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