Single Dimmer switch for Two Banks of Lights

[Johnny Butcher]

Hello all,

I real noob question here but I've looked everywhere for an answer / diagram and I just can't seem to find one...

I've recently moved into a house with a garden office. The office has 12 LED lights recessed into the roof controlled by a single simple switch. I wanted to change this to a dimmer: At the moment (as per the attached image) the brown wires are attached to the Com and L1 terminals.

I thought it would be simple enough to replicate this so bought a 400w single dimmer switch with the same standard terminals (L1, L2, Com)

When I wire the dimmer in the same manner as the switch, all lights will switch on / off but only half will dim... Could someone point me in the direction of what I am doing wrong?

Thank you!

Johnny.

 

[winston1]

Are all the LEDs dimmable types?

 

[chivers67]

Have you got the Lights Specifications? Are they actually all dimmable?

 

[Johnny Butcher]

Winston1 & Chivers67 - thank you: I hadn't even thought about that. That could account for the very random pattern of which ones dim and which ones don't! I'll try and get a couple out of the ceiling!

 

[Johnny Butcher]

There's a bit of a mixture up there!

One that doesn't dim is https://www.diy.com/departments/diall-gu10-4-7w-345lm-reflector-led-light-bulb/1324507_BQ.prd
One that does is https://www.diy.com/departments/diall-28w-reflector-halogen-light-bulb-pack-of-3/1324617_BQ.prd

Looks like it could be a simple issue!

Thank you.

 

[SFK]

Johnny,
FYI for the future if you change your lights to dimmable LEDs.
Many dimmable LEDs do not like to be controlled by 'standard' ie cheap Dimmers., causing the LEDs to flash and blink.
I tend to recommend the following dimmer for controlling dimmable LEDs:
Varilight V-Pro Training Edge LED dimmer
https://www.screwfix.com/p/varilight-trailing-edge-push-dimmer-1g-1-2w-300w-va/94816
SFK