Context: Objections to banning the use of incandescent light bulbs include the higher initial cost of alternatives and lower quality of light of fluorescent lamps. Some people have concerns about the health effects of fluorescent lamps. However, even though they contain mercury, the environmental performance of CFLs is much better than that of light bulbs, mostly because they consume much less energy and therefore strongly reduce the environmental impact of power production. LED lamps are even more efficient, and are free of mercury. They are regarded as the best solution in terms of cost effectiveness and robustness.

Question: Is the environmental performance of CFLs better or worse than that of incandescents?
Answer: better

Question: Which type of light bulbs is considered most cost effective and robust?
Answer: LED lamps

Question: What are some objections to banning incandescent bulbs?
Answer: higher initial cost of alternatives and lower quality of light of fluorescent lamps

Question: What substance in CFL bulbs raises health concerns?
Answer: mercury

Question: Do CFLs consume more, less, or the same amount of energy as incandescent bulbs?
Answer: much less

Question: What does not contain mercury?
Answer: Unanswerable

Question: What type of light consumes much more energy and therefore strongly reduce the environmental impact of power production?
Answer: Unanswerable

Question: What does CFLS's have that cause people health concerns?
Answer: Unanswerable

Question: What is regarded as the worst solution in terms of cost effectiveness and robustness?
Answer: Unanswerable