flickering downlights only with dimmer

[AJ16]

[h=2][/h]

I fitted 5 Click 50W 240V downlights and a Click 400W dimmer. The dimmer failed after short time. I just tried a 400W dimmer from Denmans but it flickers badly more so when on turned round to the fully on position. There is a normal 1 gang two way switch at one side of the room and the dimmer is the other side. When there is a normal switch each side everything is fine, it's just when a dimmer is fitted that the flickering starts. Is there an obvious reason for this to be happening?

Thanks AJ​

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[AJ16]

Lutron Lyneo Single 500 Watt Preset Light Dimmer - LLSI-502-H-F - lutron lighting | eu online shophere are loads of 500watt dimmers available.

If you have a cheap dimmer switch, you can have a strange buzzing noise. This comes from vibrations in the bulb filament caused by regulating the wave form coming from the triac. Better dimmer switches have extra components to quel the buzzing effect

It all seems very expensive on that website!