Pulsing LED downlights

Bjorn · Feb 15, 2019

hi, I am installing two LED down lights under kitchen cabinets. It is a kit supplied by Howdens including a 12v LED power supply. I have run a spur from an adjacent light switch and have put an in line switch in.

When turned on the lights are pulsing every second. I have check the wiring and removed the in line switch but the same issue remains..

Any ideas?

Thanks

telectrix · Feb 15, 2019

power supply/driver - LED mismatch take them back and buy from an electrical specialist, not a kitchen supplier.

buzzlightyear · Feb 15, 2019

Bjorn said:
When turned on the lights are pulsing every second. I have check the wiring and removed the in line switch but the same issue remains..

have you got any music pump out has well ,I bet it like disco at your house .

Wilko · Feb 15, 2019

As per Tel post, I reckon the driver doesn't work down to just a few watts. Post up a pic of your power supply if you like

Midwest · Feb 15, 2019

telectrix said:
power supply/driver - LED mismatch take them back and buy from an electrical specialist, not a kitchen supplier.

Actually the LED kits from Howdens are very, very expensive; think they source them from an electrical specialist, then make their mark up.

@Bjorn, firstly have you ensured all the connections are firmly pushed in? How have you 'spur from an adjacent light switch and have put an in line switch in'?

littlespark · Feb 15, 2019

It depends if the light switch spurred from has a neutral. (apologies @Bjorn if this isn't the case)

Test the power supply by fitting a plug with a 3A fuse in it and plugging it into a socket.

Howdens do have reasonably good kit, but more expensive for nothing more than what you can get from somewhere like screwfix

dinger809 · Feb 15, 2019

Either you have no neutral, as you’ve run it from the light switch giving only line and switch line, or is the switch a dimmer? It may not be LED compatible. I think the first is more likely

Midwest · Feb 15, 2019

See more helpful replies.

'Write your reply here.... Make sure your reply is in-keeping with the forum rules, polite and professional. If you disagree with the post(s) above, you can still be professional with your reply'.

Bjorn · Feb 15, 2019

Sorry, I actually put a junction box in the mains lighting ring and ran a spur that way so I do have a neutral.

Only thing to do is to check the connections in the junction box which is behind the wall unit.

All other connections checked and double checked

Bjorn · Feb 15, 2019

This is the transformer...

[ElectriciansForums.net] Pulsing LED downlights

Bjorn · Feb 15, 2019

dinger809 said:
Either you have no neutral, as you’ve run it from the light switch giving only line and switch line, or is the switch a dimmer? It may not be LED compatible. I think the first is more likely

It’s a normal switch, I also tried without the switch so it just be something to do with the current

Bjorn · Feb 15, 2019

littlespark said:
It depends if the light switch spurred from has a neutral. (apologies @Bjorn if this isn't the case)

Test the power supply by fitting a plug with a 3A fuse in it and plugging it into a socket.

Works fine like this.

Bjorn · Feb 15, 2019

Have bypassed the junction box by using alternative connectors and the problem remains.

It must be something to do with the current coming from the lighting ring (now embedded in the wall!)

mattg4321 · Feb 15, 2019

You've proved the equipment is not at fault.

You're now out of your depth and will need an electrician to safely connect this up for you.

Doesn't sound good what your saying about a joint buried in the wall!