LED-based light source with hybrid spot and general lighting characteristics

摘要

A luminaire includes an LED based illumination device with a light emitting area and an optical element that is configured to produce a hybrid emission pattern with a spot beam emitted within a predetermined far field angle and a background level spherical emission pattern. The optical element, for example, may be configured with an input port and an output port, and a perimeter that increases in size from the input port to a maximum perimeter and decreases from the maximum perimeter to the output port. The optical element receives an amount of light from the LED based illumination device at the input port, emits a first portion of the light from a curved, semitransparent sidewall, and emits a second portion of the light at the output port, wherein the emission area of the output port is less than a maximum perimeter of the optical element.

主权项

1. An apparatus comprising:
an LED based illumination device having at least one LED operable to emit an amount of light of a first color into a color conversion cavity, the LED based illumination device having at least one color converting element disposed in the color conversion cavity, wherein a portion of the amount of light emitted from the at least one LED is color converted to a second color and emitted through an output port of the LED based illumination device; and an optical element coupled to the LED based illumination device, the optical element having an input port and an output port, and at least one curved sidewall between the input port and output port, wherein the output port of the optical element includes a lens, wherein a first portion of the amount of light emitted from the LED based illumination device is transmitted through the at least one curved sidewall and a second portion of the amount of light emitted from the LED based illumination device is transmitted through the output port of the optical element, wherein a perimeter of the optical element increases in size from a perimeter at the input port to a maximum perimeter and decreases from the maximum perimeter to a perimeter at the output port.