Circular fluorescent lamp unit and lighting apparatus.

摘要

A circular fluorescent lamp unit comprises a circular glass bulb having a circular outer diameter set within a range of 285 to 310 mm or thereabout. The circular fluorescent lamp unit comprises a tube outer diameter set within a range of 15 to 18 mm or thereabout and an inner surface onto which a fluorescent substance is applied. A discharge medium including a rare gas and a mercury is sealed up in the circular glass bulb. A pair of electrode means is fitted in both end portions of the circular glass bulb so as to be sealed therein. So that discharge occurs in the circular glass bulb by providing the pair of electrode means with a lamp power so that the circular glass bulb lights. The lamp power has a high frequency which is not less than 10 kHz and the lamp power is set within a range of 20 to 40 W or thereabout.