Dimmer switch on hallogen bulbs

You can dim main halogens, but they will still consume relatively high amounts of power when emitting lower levels of light.

I've been using 6 of those cheap mains 50W downlighters from Homebase on a dimmer for about a year. no problems at all. (from memory the box said "suitable for dimmer switches")

You can. But youre choosing to spend a whole load of unnecessary money on electricity bills with those lights, as well as other issues. I would choose differently.

Thanks for the advice guys,

The energy issue isnt really a problem and Im only installing 2 halogen bulbs and they are going to be within a chimney breast as downlighters, in a bedroom, so only for occasional effect really, so wont be getting heavy useage! - maybe I should get a key switch to stop the wife turning them on uneccesarily!