It's amazing what you notice after you learn just a little. I was doing an organic lawn feeding today at a bank I maintain. I hadn't really paid much attention before to their minimal landscape lighting -- a few halogen up-lights under trees. But today I did a little inspection and found all the wiring just laying on the ground, some exposed. some under the mulch. Then I looked around, found the transformer, and took a peek. One run was fed into the 12V and the other run was fed into the 13V for no apparent reason. In fact, after looking around there was less wattage by lamp count on the run going into the 13V. As you may know by other posts, I am a newcomer. My findings were not astounding for you pros but it was interesting to me.