LED Pendent Light Fittings

Hi everyone,

I am a qualified electrician and have recently installed a 8watt Edison LED dimmable E27 globe (the ones that you can see the filament inside) as a pendent in one of the bedrooms in my house for a bedside table light.

The LED light is on a universal 8ch dimmer with a 31LCDA device connected across the load to stop leakage and have the light turn off. The problem is when on 10% or higher a loud buzzing noise starts... has anyone overcome this problem? i have tried using iron core transformers but problem still occurs.

My last resort is to ditch the LED and get a 40 watt filament style globe instead.

Any help or ideas will be greatly appreciated.

 

Hi Nick thanks for the quick response!
Yes you are correct for some odd reason i thought universal.

The Globe is 240V i only connected the iron core to see if more load would be sufficient. (but it still buzz's)

"it's leading edge only and this may well explain the buzzing if you are driving an electronic load like an LED lamp." - is there anything on the market that can resolve this?

I agree i am starting to think that just buying a real incandescent lamp will solve the problem... and i will just have to take the loss of the LED Globe.

http://edisonlightglobes.com/Shop/s...immable-lantern-filament-led-e27-clear-125mm/

Thanks, Gambleton

 

Thanks for providing the lamp link.
If the bedside lamps must be on a dimmer I would look at something like this.
http://www.philips.com.au/c-p/8727900894721/halogen-classic-halogen-bulb

If you really want LED filament lamps I think the best option would be to swap to a relay output unit if possible.

I like the filament style LED's and they are the only ones I have seen which provide the 360 degree output that I would like to see in a bedside lamp.

As Nick asked, where is the humming noise coming from?
Leading edge dimmer units do make a humming noise when dimmed.
Is it making a noise from the dimmer at full brightness?

 

Hi Daryl,

The noise is coming from the lamp only.. The 8ch dimmer is nice and quiet

I can get away with the lamp at 10% and not be able to hear anything but once I start to turn the lamp up (11% - 100%) the humming gets louder.

Thanks, Gambleton.

 

Ok Thanks Nick,

ill look into how much a universal dimmer costs... there is a probability that we will be getting more of these lights for the other bedrooms.

Thanks for all your help, Gambleton

 

I think it is worth checking with the lamp supplier before buying a CBus universal dimmer or two.
Don't forget the 4 channel universal dimmer will take twice the switchboard space of the 8 channel dimmer.

I wouldn't be confident of flawless dimming even with Universal dimmer and 31LCDA without trying it out.
Ask the supplier if they can guarantee it.

The supplier recommends trailing edge dimmers and does have some dimming information here.

https://edisonlightglobes.zendesk.c...e-system-compatible-with-Filament-LED-Globes-

 

Yes Daryl i agree, i also had a look at that dimming information before i purchased.

Ive bought a real incandescent now and it works flawlessly even able to dim down to extremely low levels.
The only downfall is I'm using 32 more watts then then the 8 watt LED... but o well...

Thanks for all your help guys!

Matt.