why don't you PM the person who made the photographs ?
i can't speak for him and how exactly he made them &c
other than what he stated in both the description and
in the comments area of the thread.
it seems ...
the images are stacked and separated so the viewer is looking at 2 sets of images.
the light illuminates ... the hot lights seem to be the light source he has for his project
i am guessing any sort of bright light might work, a compact fluoresent, LED ... its just to back light it ...
with "traditional" 3D stereoscopic photographic images they are not backlit, they are not stacked they are just next to each other
the stereo-opticon / viewer is sort of a magnifier and you see stereo.
a view master is a modern 3D viewer
https://www.google.com/webhp?hl=en&tab=ii&ei=yy_BVJKWFMq0ggSOjoLQDg&ved=0CBgQ1S4#hl=en&q=view+master