Planned months in advance, the lighing of fashion runways requires close attention to "the interaction between skin, clothes and volume", says Dreyfus. He also has to find a way to express the designer's concept "while respecting the eye of the audience, and the technical constraints imposed by photographers and cameramen“. Even though digital photography is slowly taking over, film photographers must know what type of film to load in their cameras. And the responsability for making models' skin look appealing lies with the make-up artist and the lighting designer. "In the fashion business, it's about the models“, he says.

In the late nineties, Dreyfus started to branch out into product design, architectural lighting and the creation of light-based artworks and installations to allow him to express his own ideas about light. When working on interior design projects such as shops or restaurants, he still applies the lesson he learned on the catwalk : "I try to flatter the skin of the people to make them feel good."

Dreyfus has been involved in lighting three Parisian boutiques. Six years ago, the French designer Christophe Pillet commissioned him to light a new Rodolphe Menudier shoe shop in Paris. The lighting had to both enhance the shopping experience and help define the luxury brand identity. The result was a black lacquer, brushed stainless steel, slate and crocodile leather interior lit by a mix of warm and cool light. Dreyfus installed floor-level fluorescents to imitate daylight and to illuminate the shopper's own shoes, so that they could compare their own footwer with the products on display.