A set of panels forming a lighting system, the set comprising a light-emitting acoustic panel and a light-reflecting acoustic panel, each panel having two opposing first sides, two opposing second sides and two opposing main surfaces, and each panel being suspended from a ceiling with a first side facing the ceiling, wherein the light-emitting acoustic panel includes a suspending member for suspending the acoustic panel from a ceiling, the suspending member being arranged on one of the first sides such that when the acoustic panel is suspended from the ceiling the two opposing main surfaces are arranged perpendicular to the ceiling, and a light source arranged on one of the second sides such that when the acoustic panel is suspended from the ceiling the light source is arranged to provide illumination in a main direction, the main direction being parallel to the ceiling and perpendicular to the normal of the main surfaces, and wherein at least one of the main surfaces of the light-reflecting panel is a light-reflecting surface, the light source of the light-emitting acoustic panel being arranged to illuminate the light-reflecting surface of the light-reflecting acoustic panel.