Discussed is a lamp or a lighting device including a wiring substrate; a bus electrode provided on the wiring substrate; a plurality of electrode lines provided on the wiring substrate, and extending from the bus electrode, each electrode line having one end and a central portion located between the one end and the bus electrode; a plurality of semiconductor light-emitting elements aligned along an extending direction of the plurality of electrode lines, and disposed to be spaced apart from adjacent electrode lines of the plurality of electrode lines by varying distances, respectively; and a plurality of transparent electrodes that respectively provide an electrical connection between the plurality of electrode lines and the plurality of semiconductor light-emitting elements, wherein the respective varying distances between the plurality of semiconductor light-emitting elements and each of the adjacent electrode lines decrease toward the central portion of the each electrode line.