If you have a lot of artwork in the house and several tracks
mounted to one dimmer have your professional electrician
install a heavier rated dimmer, because the electricity will
put heat and stress on the dimmer leading it to a
quick burn-out. One dimmer per room is sufficient. When
you start using too many dimmers in the same room some
paintings will become brighter while others will fade into the
background.  The idea with lights is to create an
overall ambiance... for the viewing of artworks.