Lighting device of discharge lamp, illumination apparatus and illumination system

摘要

A lighting device for a lamp device is provided. The lighting device comprises a circuit board and film capacitors, packaged on the circuit board by using leadless flow solders, wherein each film capacitor comprises polypropylene films and lead wires, and a material of the lead wires has a thermal conductivity lower than a thermal conductivity of copper, and terminals and internal materials of the film capacitors are leadless, wherein the film capacitors are constructed by a combination of a polypropylene film and an aluminum foil, or by an aluminum-deposited polypropylene film, and wherein a cross-sectional area of the film capacitors is 35 mm 2 or less, and a temperature at a terminal end of the lead wires in the film capacitors during a soldering process is 130°C or less.