Patent ID: 8740439

Claim:
An illuminating system, comprising: a single LED emitter having a square or rectangular emitting aperture that is d1 by d2; a four sided etendue preserving angle transforming reflector whose input aperture is disposed adjacent to the output emitting aperture of the single LED emitter receiving LED emission; a light guiding pipe whose input aperture receives light from an output aperture of the etendue preserving angle transforming reflector element, the light guiding pipe comprising a tapered light guide bar having rectangular cross-section and a light guiding pipe refraction index, a first optical film having a first optical film refractive index different than the light guiding pipe refraction index, and a first prismatic lens sheet having a first prismatic lens sheet refractive index and a specularly reflecting coating deposited upon facets of the first prismatic lens sheet, the first optical film provided between the tapered light guide bar and the first prismatic lens sheet; and a light guiding plate one edge of which is disposed adjacent to a rectangular edge of the light guiding pipe.