LED modules are a great multi-purpose lighting solution that can be adapted to suite a variety of needs. They are commonly used in signage applications, such as providing illumination to internally-lit channel letters (as illustrated below on the left), or for back-lighting reverse-lit channel letters where they provide a nice, uniform glow against a background surface (as illustrated below on the right).
But their uses aren't limited to signs. They can be used in a variety of cove lighting as well as direct border lighting applications. LED module lights are low voltage, so they are safer to handle. And thanks to their ability to be cut in field at every module and positioned at will, they are are very easy to install in custom configurations.