Abstract: A window display lighting system is provided. The system has a housing with a longitudinal interior channel. The system also has several modular light holders arranged within the longitudinal interior channel and a compressible part for resiliently holding the housing in the window. The system is capable of holding a string of Christmas lights, for example, in an evenly spaced manner in a frame of a window. The installation thereof does not require any tools or materials. The system is adaptable to fit in a range of window sizes.