Patent ID: 7847490

Claim:
A self-ballasted fluorescent lamp having a bottom end and a top end that are respectively located at two lengthwise ends of the self-ballasted fluorescent lamp, the self-ballasted fluorescent lamp comprising: a luminous tube; a cover having a bottom end, to which a base is attached, and a top end, at which the luminous tube is supported; and a lighting device provided with a substrate having a first face and a second face on both of which electronic components constituting a lighting circuit for lighting the luminous tube are mounted; wherein: the substrate has such a width dimension that enables insertion of the substrate into the base and is positioned vertically along a center axis of the base, offset from a center axis of the base; a first area is provided between the first face of the substrate and a part of a part of an inner wall of the base that faces the first face; a second area that is narrower than the first area is provided between the second face of the substrate and the inner wall of the base that faces the second face; and large-size electronic components among the electronic components are mounted on the first face, which faces the first area.