Americans spend more than 90% of their time indoors. Since Americans spend more than 90% of their time indoors, lighting should be a concern. 20% of the electricity bill, which arrives at the end of each month, is spent on lighting. Humans are always trying to buy new things and try new things that will save them money and be energy efficient. However, light-emitting diodes (LEDs) and compact fluorescent lamps (CFLs) meet these needs. LED bulbs have revolutionized and made life much easier. LEDs are light bulbs constructed differently from all other light bulbs. "LED bulbs are tiny semiconductors encapsulated in plastic. The plastic protects the components and helps focus the lights." LEDs do not have a filament like most incandescent bulbs. They have 2 terminals through which electricity flows.('"LED FAQ")Compact fluorescent lights, also known as CFL bulb and incandescent light, are much easier to construct than LED bulbs. An incandescent lamp is a normal light bulb that humans have been using for 50 years. CFL bulbs consist of two main parts, which include a simple glass tube and an electrical ballast. The inside of the tube is coated with phosphorus. Incandescent bulbs have a very simple structure. At their base, they have two metal contacts that connect to the ends of an electrical circuit. The metal contacts are attached to two rigid wires, which are attached to a thin metal filament housed in a glass bulb. (“Learn more about CFLs”) LED bulbs produce energy differently than a CFL or incandescent bulb. LEDs are tiny solid-state lights. Electricity passes through the 2 terminals of the component which conducts electricity in one direction. With electric current,...... middle of paper ......well into the earth and the environment. Although the mercury in the CFL lamp is harmful and dangerous to humans and the environment, mercury helps make CFLs more energy efficient. ("How Stuff Works, CFL") LED lights have revolutionized and made life much easier since their invention. LED lamps last on average 50,000 hours, up to 6 times longer than a CFL lamp and much longer than an incandescent lamp. LED lights are starting to become widespread around the world. LEDs emit light through a diode when electrical current from the 2 terminals powers it. CFL lamps operate by chemical reaction once they are powered via the 2 terminals. Incandescent lamps work using a metal filament that produces heat which is light. There are many advantages to using LEDs. For example, since LEDs are energy efficient, they save the customer a lot of money..