There are many different kinds of light bulbs on the market today. Jody Victor‘s crew will discuss the 3 major types: incandescent, LED, and CFL.
The we are most familiar with is the incandescent bulb. They usually have a tungsten filament enclosed in glass that has an inert gas in them. Electric current passes through the tungsten filament and heats it to a temperature that produces light. About 90% of their energy is given off as heat. This type of bulb is being slowly phased for more energy efficient types. These bulbs are being phased out in the typical wattage we are used to. (For example 100W, 60W, etc.) Through some loopholes incandescent light bulbs are still being made in equivalent amounts. Instead of 60W, you can buy a 43W which will still have the same amount of brightness. They are using different gases as well (mostly halogen) which is why they may cost a little more, but they burn more efficiently.
CFL (Compact Fluorescent)
CFL bulbs are those curly type bulbs you see that will still fit your light sockets. The problem with these bulbs is they contain mercury. They are also known to cause anxiety, dizziness, seizures, inability to concentrate, and migraines. They also can contain phenol, naphthalene, and styrene which are known carcinogens. They are so toxic they cannot even be disposed if in the trash. They are made of glass tubes filled with gas and mercury. The light is produced when the mercury has electricity running between the two electrodes in the base of the bulb. This produces ultraviolet light and heat. The UV light becomes visible light when it strikes a phosphor coating on the inside of the bulb.
LED (Light-Emitting Diode)
These are the most costly of the energy-efficient bulbs. They also last the longest and are the moste energy-efficient and burn the coolest. These are the same as the bulbs you already have lighting up your clocks, some Christmas lights, and traffic signals for just a few. They are considered solid state and is silicone based. There is positive and negative material sandwiched beside each other (called a p-n junction). This type of bulb does not radiate heat. An Energy Star rating will guarantee the color requirements, output minimums, compliance with more than 20 industry stantdards, testing, and 3-year minimum warranty.