Lighting Products and Fixtures Design Olah Light by Maurice L. Dery Olah is a wall sconce using a circline fluorescent bulb, that is integral to the lighting design. Ingenuity and a love of engineering enabled the creation of this light without any visible fasteners. The light is unique because of its versatility in hanging options. The light can be mounted in four different ways, using a specifically designed universal bulb holder, and a distinctly designed mounting plate to install the sconce. What you receive with Olah is four lights in one.