I have become a true believer in the Compact Fluorescent (CF) lamps than
replace "Edison base" standard lamps.

The problem is that ceiling fan light of the "schoolhouse" type (round
globe) will not accept any but the smallest CF.

A 10" diameter globe would only take a 15 watt CF. In theory that's as
bright as a 60 watt conventional light but who is kidding!

In a rental property, we have two fans with small globes (8"?). The only
CF that would fit was only 5 watts. The same fixtures could take (and I
installed) 60 watt incandescent bulbs. I would MUCH rather use a CF. I
would need a CF that doesn't exceed about 3.5" in any dimension but that
puts out more 15 watts of CF light. That's not much but it's better than a
5 watt light.