Pot lights can best be separated into 2 different housing configurations:
1) The retrofit Type and,
2) The new construction Type.
The retrofit is the most popular style for renovations because it can be easily installed into drywall with the least amount of drywall repair. New construction pot lights are best suited when constructing new buildings but can be used when the opening they will be installed into can be easily accessed, such as the attic. When installing pot lights into any space that has insulation in it the pot light must be rated for Insulation Contact “IC rated”. Non IC rated pot lights can be installed when no insulation will be making contact with the pot light and the pot light is kept at the recommended distance from the insulation. Many different trim rings are available for pot lights. Whenever a pot light is installed in a shower the proper shower rated trim must be used. When installing a light bulb/lamp into a pot light be sure to not install a lamp which exceeds the recommend rating. When installing pot lights its important to not install to many onto one circuit. Only qualified electricians should install pot lights.
Low Voltage Pot Lights use a transformer to lower the voltage to 12V. Many designers prefer using low voltage pot lighting because it allows the the use of lamps that have a greater selection of light beam angles.
Line Voltage Pot Lights are the most common and use the typical household voltage of 120vac to power the lamp directly. Line Voltage pot lights are the most economical pot light.