Fed Govenment never required CFL or any other specific technology
The government regs never specified what kind of bulbs to replace incandescent. All they did was require that light bulbs meet a specific level of increased efficiency. The existing incandescent bulbs could not be re-engineered to meet the standards so they were effectively banned. Initially the industry had only CFL and halogen technology that could meet the standards. Now, the LED technology has improved to meet the needs for general purpose domestic use, and the price / availability / styles increased to where LED is the 'way to go'.
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