Sure AC has a benefit, but what about the people in Texas who have it set to 70? Why do they need it that low? They can't get the same benefit by setting it to 78? Would probably have a MASSIVE effect on electrical usage. WAY more than lightbulbs which are generally used at night when there is less demand.
Same with computers. Do people who surf the web need a 4ghz processor? Is it faster to surf the web at 4ghz than 2ghz? Why not mandate any processor over a certain power requirement be phased out? Why do people need Quad or Six core processors for surfing the web?
But seriously. How many people in here posting about the benefits of CFL's probably waste WAY more energy than that leaving their laptops on or setting their AC low, or running any of their 10 million other gadgets? Or for that matter, taking a long shower, or leaving the water running while brushing their teeth? Singling out light bulbs is absurd with the amount of power we use and I bet every single one of the sanctimonious assholes in this thread saying this should be mandated probably waste as much or more than the average American but they sure feel good about forcing others to do something that has almost no impact on our rate of electricity growth.
So you're saying because we waste energy in some ways that we shouldn't try to conserve it in others. That's a terrible argument.
Approximately 12% of US electricity use is for lighting. Making it more efficient would most certainly have an impact on our rate of electricity growth.