A lighting apparatus comprises an LED-mounted substrate and an exhauster. The
substrate
has a flat area as well as one or more raised areas of trapezoidal cross section
which each form a passage thereunder. LEDs are mounted on the raised areas. When
the LED-mounted substrate is installed on a wall, the passages are enclosed by
the wall. The exhauster removes the heat from the LEDs by drawing out the air going
through inside the passages.
