A multiple-ply solid state light fixture is disclosed. A panelized, solid state light fixture includes combined layers of material chemically bonded together without a traditional mechanical housing and with relatively few or no fasteners. In example embodiments, the solid state light fixture includes an LED mounting substrate, a thermal material on a non-LED side of the LED mounting substrate, and an optical material on the LED side of the LED mounting substrate. A plurality of LEDs are disposed or mounted, with or without additional packaging, on the LED side of the LED mounting substrate. A chemical bond is created between the substrate and the other layers. This chemical bond can be created, for example, through use of applied fluid or gelatinous compounds that are then solidified, or through the use of adhesives.