That is still not to say that I agree with the legislation, though. I agree that encouraging the use of modern efficient replacements for the old bulbs is good, it is bad legislation on principle, if for no other reason. It is FAR beyond any power our ancestors ever imagined giving the Federal government... and in fact they really don't have the legal authority to ban bulbs, regardless of what laws they pass.
Sorry I am going to use your post as the soap box on how government should set the tone and directions on technological advancement, environmental protection/public health, and social standard through executive branch regulation and legislation. The government has the implicit power to set the direction and tone through its position in leadership. After all that is what leadership is about.
Also noted that the legislation in US does not specifically ban the production of regulator incandescent light bulb. Instead the language specifically address the efficiency of the new light bulb produced. If the combination of materials and manufacturing process would make non-gas filled incandescent to perform up to the efficiency standard it can be produced. Of course the manufacture will want to charge premium for the patent and manufacturing process. That's capitalist market working right there, taken advantage of people's desire of keeping with the old stuff.
The government has the capacity and ability to set the tone for either the welfare of the general public (environment and public health and safety). To regulate and encourage interstate commerce (the Commerce Clause) gives the federal government to set regulation on technological grounds that draws a more even line for fair competition that would otherwise not happening because the laziness of human nature or the extra expense that would not immediately benefit the merchant on a short-term basis, especially if individual business can choose to abide or not. Since the timing of the legislation in 2007 the manufacturing process is maturing for the newer, higher efficiency light bulb it is fair to set the new standard so that everyone doing business in United States are competing on a new standard that is fair for everyone. Where the old light bulb production is already on decline, this allows all the manufactures to focus their resources and energy on newer standard without the distraction of having the keep up with the old stuff. If this was enacted in 2001 I would agree that the government is forcing its hand on a non-matured, to be proven technologies without basis. But to say that government does not have the power to regulate because it can abuse it is like saying companies don't need CEO and Chairman because bad leadership can happen all too easily.