Jeremy,
Lights in Pietenpols are not too common, but it has been done, on occasion.
It is a feature that adds weight for something that likely is rarely going
to be used. There are two Piets that have lights that are based close to
Brodhead and regularily attend the annual Piet gathering there. They were
built together, and are practically identical. These planes are both powered
by O-200, so they have a bit more power to carry the extra weight. Here's a
link to one photo from WestcoastPiet that shows a light in the wing of N57TL
(it's twin is N58TL).
http://www.westcoastpiet.com/images/Tim%20Mickel/IMG_2151.JPG
Bill C.
