Our trimmed 3" wide recessed linear LED fixtures are offered in two configurations: low-voltage (requires an external power supply), or "universal voltage," meaning that the fixture has an integral power-supply and can be connected directly to the "line-voltage" of the home/building. Our low-voltage configuration can be purchased in custom size increments and is more easily customized to create custom shapes, colors (RGB and RGB+W available), and dimming options. Our line-voltage fixture is simpler and quicker to install, but is only available in standard sizes (MOQ or up-charge for custom sizes), and is generally better suited for commercial applications such as office buildings, schools/universities, and retail stores.