Abstract: Discoloration and deformation of a resin case triggered by heat generation from a failed circuit component at the end of the life of an arc tube are prevented without increasing the cost and size. A lighting unit that lights a light source with an inverter while receiving electric power from an AC power supply, and that contains a lighting circuit that includes a plurality of circuit components inclusive of capacitors. Among the capacitors, all capacitors with an applied voltage of 50V or greater (C4, C5, C6, C7, C8, CD1 and CD2) are foil type film capacitors with exceptions of smoothing electrolytic capacitors (CD1 and CD2).

Abstract: The present invention provides a single base fluorescent lamp of a bulb-type or the like that is capable of achieving a peak luminous flux output value when used in a lighting fixture. That is, a lamp (1) has an arc tube (2) that includes therein a spirally-wound spiral part, a pair of electrodes and a winding discharge path, a resin holding member (3) that holds the arc tube (2) such that the arc tube (2) stands, a base (6) for being connected with a lighting apparatus. The present invention has a maximum luminous flux output when a lamp ambient temperature reaches a predetermined temperature of 30° C. or higher.

Abstract: Discoloration and deformation of a resin case triggered by heat generation from a failed circuit component at the end of the life of an arc tube are prevented without increasing the cost and size. A lighting unit that lights a light source with an inverter while receiving electric power from an AC power supply, and that contains a lighting circuit that includes a plurality of circuit components inclusive of capacitors. Among the capacitors, all capacitors with an applied voltage of 50V or greater (C4, C5, C6, C7, C8, CD1 and CD2) are foil type film capacitors with exceptions of smoothing electrolytic capacitors (CD1 and CD2).