I have a standing floor light which holds 10 x 20w Halogen Capsules(12V). I am unable to source lower wattage frosted halogens and have been looking into fitting a dimmer instead as the light at full strnght is too bright. Do dimmers exist as adaptors? i.e can i pug something into my wall before the lamp to work as a dimmer or do i have to fit the light staight into a dimmer socket in the wall - if so, what type of dimmer do i need?