A light fixture that may include a dome member including exterior and interior surfaces, and a panel positioned adjacent to (e.g., attached to) the interior surface of the dome member. The panel may comprise carbon (e.g., carbon fiber, providing relatively high thermal conductivity). The panel may provide a mounting surface to which circuit boards including one or more LEDs are mountable. For example, the panel may include raised portions and recessed portions. The raised portions may provide a mounting surface to which the circuit board(s) may be mounted. The circuit board may span the distance between adjacent raised portions of the panel, spanning a corresponding recess. Such a recess may provide for a gap (e.g., an air gap) on the underside of the circuit board, for improved air circulation (facilitating convection cooling). Such a gap may also facilitate easy electrical connection of electrical power to each circuit board.