A lighting apparatus includes a tilt housing, a bottom plate, a first cap cover, a second cap cover, a driver, a light source plate and a light passing cover. The lighting apparatus may be installed in a closet. The tilt housing includes a tilt plate, a top plate and a side plate. The tilt plate has a first side connected to the top plate. The bottom plate has a front side connected to a second side of the tilt plate. The bottom plate also has a back side connected to the side plate. The second side is opposite to the first side in the tilt plate. The bottom plate and the tilt housing form a polygonal tube defining an inner container. The first cap cover and the second cap cover are fixed to two opposite ends of the polygonal tube for concealing the inner container.