Lol I've done that before. Usually with slide though and the camera can never seem to record the full range. I did it with a fluoro desk lamp. One of those long flat ones I just turned upside down and covered it with diffused paper, sat the film on top and it worked alright. Fluoros are reknowned for unpredictable colour temperatures though so it wasn't always fun trying to get it right. The biggest downfall for me was the curvature of the film. It can be done though. Ideally you'd be putting the film on a flat surface backlit by a light with a constant brightness and temperature and put like a sheet of glass over your film to keep it flat. But then if the glass is thick or imperfect or has a colouration like most do...oh just use a scanner.