The disclosed lighting apparatus has a light-diffusive panel having opposing first and second faces bounded by one or more sides and having one or more channels extending inward from one of the one or more sides. A first conductor is disposed on the first face of the light-diffusive panel and is proximate a first side. The first conductor has a concave section disposed within a channel of the one or more channels. A second conductor is disposed on the second face of the light-diffusive panel and is proximate the first side. The second conductor has a concave section disposed within a channel. Solid-state lighting (SSL) elements have light emitting portions that face a second side that is adjacent to the first side of the light-diffusive panel, and the SSL elements are electrically coupled to the first conductor and to the second conductor.