Patent ID: 8801205
Filing Date: 2014-08-12
Classification: F21K,F21V,F21Y,H05B

Abstract:
1. An LED based illumination device, comprising: a color conversion cavity comprising a first surface area including a first wavelength converting material and a second surface area including a second wavelength converting material; a first LED configured to receive a first current, wherein light emitted from the first LED enters the color conversion cavity and preferentially primarily illuminates the first wavelength converting material, the first wavelength converting material is physically separated from a light emitting surface of the first LED, wherein a light emitted from the LED based illumination device based on the light emitted from the first LED has a first color temperature; a second LED configured to receive a second current, wherein light emitted from the second LED enters the color conversion cavity and preferentially primarily illuminates the second wavelength converting material, the second wavelength converting material is physically separated from a light emitting surface of the second LED, wherein a light emitted from the LED based illumination device based on light emission from the second LED has a second color temperature that is different than the first color temperature; wherein the second LED is mounted to a mounting board at an oblique angle with respect to the first LED; and wherein the first current and the second current are selectable to achieve a range of correlated color temperature (CCT) of light output by the LED based illumination device.