Integrated LED fixtures come complete with the LED arrays already built into the fixture. They are designed to provide a specific color and Lumen output and they do not have typical “bulbs” that can be replaced.Integrated LED fixtures typically last for many years, often a decade or more. Lumens(denoted by lm) are a measure of the total amount of visible light (to the human eye) from a lamp or light source. The higher the lumen rating the “brighter” the lamp will appear. See More.