A ceiling system includes a support structure configured to be installed in a ceiling area of a variety of room types. A ceiling supported by the support structure may cover the majority of the ceiling area and may include light sources to light the room. The ceiling may be defined entirely by panels extending continuously from one end of the ceiling to an opposite end of the ceiling, arranged side-by-side with troughs in between. The panels may themselves be the light sources. Alternatively or additionally light sourced may be disposed within the troughs.