Lens-design Software: Freeform LED lens-design approach produces high uniformity

One of the most actively developed uses for freeform optics right now is as light collectors and uniformizers for spotlight and directional-floodlight general-illumination LEDs. Due to a diffuse—and often nonrotationally symmetric—directional light output, a bare white-light LED device itself (usually consisting of a flat blue LED with a layer of yellow YAG phosphor), while very bright, cannot efficiently serve as a floodlight illuminator; it needs to be paired with optics. Freeform optics, with their many tweakable degrees of freedom, are an ideal choice.

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