There are four basic types of lighting: incandescent, fluorescent, high-intensity discharge, and low-pressure sodium.
Incandescent lighting is the most common type of lighting used in homes.
Fluorescent lighting is used primarily in commercial indoor lighting systems,
while High-intensity discharge lighting is used only for outdoor lighting applications.
Low-pressure sodium lighting is used where color rendering is not important, such as highway and security lighting. These lighting types vary widely in their construction, efficiency, color characteristics, and lamp life.