To provide a bulb type fluorescent lamp of 35 W or less equipped with a high frequency generating circuit having reduced harmonics so as to comply with requirements regulated in IEC standards or the like and a lighting system having the bulb type fluorescent lamp.

This device is equipped with a smoothing capacitor to smoothen a direct current rectified by a rectifying means, a high frequency generating circuit, which is connected in parallel with the smoothing capacitor, to convert a direct current to a high frequency AC current and a fluorescent lamp activated by the high frequency generated by the high frequency generating circuit. When a proportional coefficient to be multiplied by C0 to make a rated power consumption W (W) of a bulb type fluorescent lamp under a fixed commercial AC voltage V condition equal to a numerical value of a capacitance C0 (μF) of a basic smoothing capacitor at which a fifth harmonic component shows 61% when the fluorescent lamp is lighted is set for α, the capacitance C of the smoothing capacitor is set to comply with the relationship equation of W≥αC, and therefore, a bulb type fluorescent lamp complies with requirements for a relative harmonic content regulated in IEC standards or the like.