Final answer:
The demand for LED lightbulbs has decreased from 2013, as more energy-efficient options like CFLs and LEDs are being adopted due to their efficiency and longevity.
Explanation:
LED is the type of lightbulb whose demand has decreased during the specified time period of 2013. The U.S. government has mandated the transition to more energy-efficient lighting like CFLs and LEDs due to their higher efficiency and longer lifespan. In recent years, LED lights have been increasingly replacing older light sources due to their superior efficiency and durability.
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