| 摘要 |
In a circular fluorescent lamp unit comprising: a glass bulb 1 which is bent into a ring shape with both ends abutting on each other, has phosphor powder coated on an inner wall thereof, has electrodes provided at the respective ends in an inner space thereof and has mercury and inert gas sealed therein; and a cap which has connection pins used for electrically connecting the electrodes in the glass bulb with the outside and is attached so as to cut across the both ends of the glass bulb, a tube outer diameter of the glass bulb 1 is 13 mm to 20 mm, a ring outer diameter of the ring is 145 mm to 170 mm, lamp wattage is not more than 20 W, and lighting is carried out with a high frequency which is not less than 10 kHz.
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