For general downlight applications that demand high efficiency, superior optical control, and a square aperture shape is preferred. One piece trim eliminates mitered flange corner joints and inside corner gaps. Patented Bounding Ray optics provide high efficiency, and superior lamp shielding. Lens for low angle shielding. Patent pending rough in design allows quarter adjustments in all directions and up to 5 degrees of rotation allowing post installation adjustments to ensure consistent trim to trim alignment. Lamp included.