Above is a video showing brief clips from the documentary Painting with Light about Louise Dahl-Wolfe.
In the full half hour video, Louise, herself is interviewed as well as some of those people that worked with her throughout her time at Harper's Bazaar. This film gives a good insight into her personality and how she viewed photography as a medium as well as how and why she used the techniques she did.
You can find the full length documentary at the following address: http://www.youtube.com/watch?v=E5QNxkFF6j4
Video Reference:
Neff, Tom. (Producer). (1999). Louise dahl-wolfe: painting with light [Web]. Retrieved from http://www.youtube.com/watch?v=Quz6NprfcuM