TOTAL INTERNAL REFLECTION LENS HAVING A TAPERED SIDEWALL ENTRY AND A CONCAVE SPHERICAL EXIT BOUNDED BY A COMPOUND PARABOLIC CONCENTRATOR OUTER SURFACE TO LESSEN GLARE WHILE MAINTAINING COLOR MIXING AND BEAM CONTROL OF AN LED LIGHT SOURCE

摘要

A multi-color LED illumination device and specifically a lens comprising a cylindrical opening extending into the lens from a light entry region at which LED(s) are configured. A surface extends across the lens' light exit region, and a TIR outer surface extends between the light entry and exit regions. There are diffusion surfaces on the cylindrical opening's sidewall and upper surfaces and, if glare control isn't needed, the light exit region. Lunes can be configured on the cylindrical opening's sidewall surfaces, and on the TIR outer surface. As another example, diffusion elements are manufactured and possibly increased on only select surfaces but not on the light exit region. Three light interactions in a first portion of light and two interactions in a second portion of light can improve color mixing and beam control. Those interactions include two refractions either with an intermediate reflection or not.