The present invention relates to coating compositions containing a polymeric or copolymeric levelling agent, which has been prepared by nitroxyl-mediated polymerisation. A color film with transmittance which is molded and which has a desired color for design is formed on the surface of the above plating layer. Standard PCB board-to-board connectors may be provided at an edge of the circuit board and a further circuit board provided with a series of conductive tracks may provide both a mechanical and electrical connection between the circuit board and the light sources. Connection patterns are formed in the shape of lines on the inclined side surfaces and the upper surfaces of the semiconductor chips to electrically connect pads of the semiconductor chips.