Is it  possible to have your subject light itself?

Well in this case it was. The majority of the fill came from a large tin wall behind me and massive amounts of concrete surrounding the whole area, with the exception of a little fill  coming from a pop-up flash on camera to reduce the waterfalls shadow. Result, wall lights water, water lights waterfall, and initial light source serves as the main element in composition. In this case the superwide  worked.

Nikon D. 70, 10.5mm, ISO 200, at 22 at a 500th, Post in Photoshop