Patent ID: 6956327

Claim:
A self-ballasted fluorescent lamp comprising: an arc tube comprising: a plurality of U-shaped bent bulbs arranged in parallel, each of the U-shaped bent bulbs comprising a straight portion, and the U-shaped bent bulbs connected so that the straight portions of the U-shaped bulbs are aligned in a circle; a crown; a cover comprising: a base being adapted to permit the arc tube to be attached thereto; a lighting circuit contained in the cover; a globe attached to the cover and enclosing the arc tube having a diameter and a base end, an edge of an opening of the globe being formed into a fitting edge to be fitted in an opening at a bottom of the cover; a first dimension being a distance between the globe and each crown of the arc tube; a second dimension being a distance between the diameter of the globe and the arc tube; and a third dimension being a distance between the base end of the globe and the arc tube, wherein the second dimension is greater than the first dimension when the first dimension is greater than or equal to the third dimension, wherein the arc tube further comprises: an outer tube diameter from 8 mm to 11 mm; and a width being a dimension along which the U-shaped bent bulbs are arranged, the width ranging from 32 mm to 43 mm and, the diameter of the globe being from 55 mm to 60 mm.