The GE high efficiency incandescent bulb sounds like a very interesting option, but will it be legal under the proposed ordinance?
As for compact fluorescents, they may be more efficient, but they have some downsides:
Ugly color spectrum (sorry, they are not dead ringers for real light bulbs)
60-Hz flickering (I don't know... maybe I'm the only one who has spent a day at work writing on the computer, and come home and shut my eyes to a 60-Hz afterimage - but it is creepy, and I think the constancy of incandescents is a restful relief)
Noise (varies, but it could be bad, especially if the fixtures are installed per ordinance and maintained only as legally required)
Mercury pollution (will ANYONE really pay a fee to dispose of them, when the whole city is full of open dumpsters???)
I should also point out that Wisconsin, unlike California and Australia, is cold most of the time. Note that the "inefficiency" of incandescent bulbs is that most of the energy goes directly to heat. Basically, they are electric heaters that glow a little. Electric heat is expensive and inefficient, sure, but it is not the same as purely wasting the energy.
Considering all of these factors, I think that a mandatory ordinance is at best premature. The mercury factor could be especially bad because forcing non-environmentalist sleazy landlords to install large numbers of fluorescents sounds like it should lead to a LOT of illegal disposals, and God knows where the stuff could end up.