This is the 4 inch ALED Open Reflector Downlight. Its optical system contains a self-flanged, semi-specular, matte-diffuse or specular lower reflector utilized in combination with a highly transmissive lens.
LEDs are completely concealed providing superior aesthetic
appeal. LEDs in a proprietary mixing chamber provide consistent
performance balancing glare, uniformity and efficiency.
Patented Bounding Ray Optical Principle design (U.S. Patent
No. 5,800,050) provides 40 degree cut-off to source and source image for a smooth transition from top of the reflector to bottom.