Can someone help with information on a dimmer swith problem?

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Hello members of DIYnot.com.

Just wondering if anyone can help me with some information on a dimmer switch please as I can’t seem to figure it out no matter what I try?

I have a 3 gang dimmer switch, 60 - 400W, 230V a.c.
Circuit 1 = 5 x 35W down lights. Each light is fed from 12 volt transformer.
Circuit 2 = 5 x 35W down lights. Each light is fed from 12 volt transformer.
Circuit 3 = 4 wall lights (dimmable) with 2 x 20W lamps on each patress and these are also fed via a 12V transformer that are concealed in the lights enclosure.

The problem I am having is circuit 3 (the wall lights) is perfect when on full load but when they are dimmed (even slightly) a loud buzzing comes off the transformers (not the switch) within the enclosure and the lights flicker. I thought this might have been as the minimum power was not met and thus tried putting all 3 circuits on one gang but this did not change anything. Circuit 1&2 = no problem, Circuit 3 = headache.
Is there something that I am overlooking or has anyone else had this problem?
Do the 12V transformers change the total load power?

Thanks in advance for any replies as I have now ran out of options? :confused:
 
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These are the wall lights. They came from wicks.

Deus Wall Light

Product Code: 187189


Type: Contemporary Light
Max. Wattage: 20W
Voltage: 230V
Bulb Type: G4 Capsule
Width: 100mm
Finish: Chrome




•Ideal for living rooms, bedrooms and hallways
•Includes 2 x 20W G4 halogen bulbs
•Can be dimmed using a standard dimmer switch
•To fit this product you will need an electrical slotted screwdriver and a cross head screwdriver
•Fixings included
•Easy-to-follow fitting instructions
 

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