A circular fluorescent lamp comprises a light-transmitting circular tube,
filled with a discharge gas including mercury and a rare gas, having an
outer diameter between about 14 mm and 18 mm. A phosphor layer is coated
on the inner surface of the light-transmitting circular tube. A stem seals
each end of the light-transmitting circular tube air-tightly, and holds a
pair of conductive wires. One of the ends of each pair are connected to a
filament, and the other of the ends extend outwardly from the circular
tube. A lamp base is arranged between the ends of the light-transmitting
circular tube so as to rotate slightly around the center axis of the
circular tube and includes conductive pins, which are connected to the
conductive wires. An insulator, arranged between at least one pair of the
conductive wires, limits the movement of the conductive wires. The
circular fluorescent lamp may be used for a lighting fixture.
