kitchen rotary switch and LED ceiling spots flickering

[kofi2003uk]

hi everyone, have 8 dimable spot lights (GU10) in kitchen ceiling. decided to change them to dimmable LED's. the switch is a dimmable switch (rotary). now 2 of the lights flicker. any idea why please? also the switch has a buzzing sound to it.not loud but can hear it if close to it. see picture of back of current switch attached. the current wattage of the new LED's i installed are 4.5w.

i also noticed the earth cable (green/yellow) is not connected. could this be the issue? am no electrician so have no idea.

what could be the reason for the flickering? do i need to change the switch to a new dimmable rotary swithc and if so could you recommend one from say screwfix/toolstation or B&Q? many thanks

 

[flameport]

You can try adjusting the small adjuster screw on the back of that dimmer.
However as it states 60-400VA and you only have about 36 in total, it's not likely to work well.

A different dimmer suitable for lower loads would be a likely solution.

The earth wire should be connected to the metal plate.
It's unrelated to the flickering.

 

[kofi2003uk]

Thank you so much. Am considering replacing the switch with the below. Hope that will work fine?
I hope the below comes with clear instructions on how to wire it, assuming it’s the correct switch to start with.
https://www.toolstation.com/bg-nexus-metal-brushed-steel-200w-intelligent-led-dimmer-switch/p41340