Flush luminaire with optical element for angular intensity redistribution

A flush luminaire configured to provide a predetermined distribution of light about a horizontal surface comprising:

• a housing having an internal cavity disposed beneath the horizontal surface, wherein the housing defines an opening disposed adjacent the horizontal surface;
• a substantially flat transparent optical window having a surface, wherein the optical window surface overlays the housing opening;
• a heat-generating light source disposed within the housing cavity, wherein the light source provides a spatial light distribution pattern which defines an optical axis that is disposed substantially perpendicular relative to the optical window surface;
• an effective amount of a heat-transfer surface, disposed adjacent the light source in a heat-transfer relationship, to provide for removal of heat that is generated by the light source;
• a temperature-control device disposed within the housing cavity adjacent the light source and in association with the heat-transfer surface for achieving a substantially uniform temperature profile for the light source;
• and
• an optical element disposed within the housing cavity, wherein the optical element redistributes light rays emitted by the light source along preselected angles relative to the horizontal surface.

A method for designing a circular prismatic light transformer, comprising:

• (A) selecting an oscillation stop sign value, a constant coefficient value, an incident angle value, a radiant angle value, and a facet inclination angle value;
• (B) selecting an incident angle increment value and calculating a radiant angle increment value and an inclination angle increment value, to determine an incident intensity value;
• (C) either (i) increasing the coefficient value and increasing the oscillation stop value by 1 or (ii) decreasing the coefficient value and decreasing the oscillation value by 1, if the determined incident intensity value does not meet preselected criteria;
• and
• (D) repeating steps (B) and (C) until predetermined optical criteria are met.