Abstract: A luminaire includes a light transmission unit and a light source that are disposed in a housing assembly of the luminaire such that light emitted from the light source enters a lightguide panel of the light transmission unit through an edge of the lightguide panel and exits the lightguide panel through a surface of the lightguide panel that is substantially perpendicular to the edge. A length of the luminaire along its long side is greater than a width of the luminaire along its short side, while a height of the luminaire with or without any appropriate electronic component that is mounted thereto is less than the width of the luminaire as well as a width of an aperture of a recessed installation structure, such as a T-grid frame or a drywall frame, through which the luminaire is to be installed. The luminaire includes grid clips for recessed installation.

Abstract: A modular luminaire includes a pair of side rail assemblies that support a light transmission assembly therebetween. Each side rail assembly includes a light assembly cavity and an alignment slot that houses an alignment rod therein. A coupling bracket that includes a latch device is coupled to the pair of side rail assemblies. A light source is disposed in the light assembly cavity of at least one of the pair of side rail assemblies such that an edge of a lightguide panel of the light transmission assembly is disposed adjacent the light source. The lightguide panel receives light from the light source through the edge and emits the light through a surface that is substantially perpendicular to the edge. The alignment rod of at least one of the pair of side rail assemblies and the latch device operate in concert to row mount the luminaire with another luminaire.