A: I would seriously doubt it would fit. The bulb it 4.75 inches in diameter and 10 inches tall. My review has a photo of it next to a "normal sized" CFL.
A: Bulb is large. 8" tall, 3 1/2" in diameter. Medium base.
A: Yes it is.
A: Yes, I recently purchased this bulb and its box does have the UL listed logo on it