Kreisförmige Fluoreszenzlampe und Leuchter

摘要

A circular fluorescent lamp unit (2a, 2b) comprises a circular glass bulb (3) having a circular outer diameter set within a range of 285 to 310 mm or thereabout. The circular fluorescent lamp unit (2a, 2b) comprises a tube outer diameter set within a range of 15 to 18mm 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 (3). A pair of electrode means (5) is fitted in both end portions of the circular glass bulb (3) so as to be sealed therein. So that discharge occurs in the circular glass bulb (3) 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 10kHz and the lamp power is set within a range of 20 to 40W or thereabout.