I have two 6-way strips of halogens (50W GU10's) that I want to control via a 2-gang dimmer. Most dimmers I have seeen say they are rated at 400W, but when you read the small print they say they are only rated at about 250W if using hologen's. Given that I need 300W per dimmer can any one recommend a dimmer for the job? I have heard you can get 600W two-gang dimmers on a double face-plate, but they sound very expensive. The last company I contacted (Hamilton's) said their policy with 400W dimmers was to de-rate them by just 25% (i.e. giving me the 300W I need), but they didn't sound confident. Any help gratefully received.