Jim, it's kinda hard to compare what is equivelant as far as florescent vs. incandescent. the florescent gives a different kind of light, which is fine for most but i have known a few people who didn't like the change and actually switched back. that being said, i converted a lot of the fixtures in my previous SOB to florescent. i found that the 16 watt were more than adequate in the larger areas such as kitchen/living areas that were attached at the roof/ceiling. in smaller areas such as over the dinette, at the vanity in the bedroom etc i installed the smaller 8 watt fixtures i happened to find that were the same shape and size as the oem single bulb fixtures. the florescent bulb in these fixtures was a u shape, and the fixtures looked really nice. couldn't even tell they were different until you turned them on.
in my opinion the 30 watt would be an overkill, but YMMV. to each his own.