I designed a project last fall where soffit down lighting was used around the perimeter of the home. Uplighting - good ole 12 volt landscape fixtures - were incorporated to put the extra punch on the stonework. After considering a few options, I decided to hire an electrician to install the soffit fixtures. Here are some of the factors that I considered:
Line voltage fixtures with integrated LV transformers allowed me to match the MR16s to each of the several different levels of roof line.
With 120 volt, I need not concern myself with voltage drop, allowing the electrician to daisy chain, saving considerable amount of wire. (As mentioned, our direct burial 12-2 is NOT to be used in cavity)
Fixtures allowed us to fit with frosted lenses, and I supplied all equipment, including (and most importantly) the MR lamps.
Trim ring selection was fantastic, client got just what he wanted.
The electrician performed the installation under my direction, while my crew was installing the landscape lighting portion of the project.
Soffit lighting was wired in zones, allowing control system to dim and stage ON and OFF times. Perfect!
Sorry, I do not have a photo. The other work on the home wasn't completed for quite a while, and I just haven't gotten back there yet after dark.