GFCI, or Residual Current Device (RCD) is a device that shuts off an electric power circuit when it detects that current is flowing along an unintended path, such as through water or a person.
It is used to reduce the risk of electric shock, which can cause the heart to stop or cause burns. They can also prevent some fires, like when a live wire touches a metal conduit.
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At present, the enterprise industry is willing to adopt LED lights, mainly because the maintenance cost is low, which means that LED lights can save manpower maintenance expenses, but the general consumer market is still willing to buy LED bulbs. Of the 5.6 billion bulbs used in American homes, LEDs account for less than 1%.
LED lighting manufacturer Cree is disappointing to see the popularity of LED lights in the commercial market, decided to change the policy, launch new LED bulbs for the general mass market, expect consumers to use LED bulbs at home, bring influence to the office . Cree's new 40-watt and 60-watt LED lights are priced below $14.
Cree CEO Chuck Swoboda said, “Our goal is to replace every incandescent bulb.†Cree expects the bulb to follow the smart phone with built-in touch screen, and consumers are used to it at home. Use a smart phone and bring this habit to work.
Professor David Yoffie questioned the theory that LED lights can be popularized from the home to the workplace. He bluntly said, "Because you have to spend many years to see the benefits of LEDs."
Industry insiders predict that the popularity of LED bulbs in the residential market will not be expected to jump from the current 1% to 32% by 2020. 
Cree launches affordable LED bulbs to enter the home lighting market
Although LED bulbs have 80% more power saving than traditional bulbs and have a service life of up to 10 years, LED bulbs have not been able to successfully enter the home market due to excessive prices.