Stephanie (Penney) Dodson, president of Design Partners Inc., an association of lighting designers and directors of photography, died Fridayat her home in Calabasas after a lengthy battle with lung cancer. She was 45.When Dodson was 21, she became vice president of Imero Fiorentino Associates, a lighting design company. In 1983, she and Bill Klages formed an association of lighting designers, the Klages Group. In 1996, Dodson took over the company and renamed it Design Partners Inc. Dodson is survived by her husband, Norm, a son and daughter, a sister and brother, and her parents. Family suggests donations to the American Cancer Society.