25 September 2014 Study of CCT varying by volume scattering diffuser with moving and rotating white light LED
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Abstract
In this study, the corrected color temperature (CCT) of white light, which originates from a white light LED (WLLED) and passes through a volume-scattering diffuser (VSD), is investigated. The VSD with thickness of 2mm is fabricated by mixing the 2um-sized PMMA scattering particles and the epoxy glue with different concentration values. Moreover, in order to understand the influences of the illuminated area and the scattering path of VSD on CCT values, the bulletheaded and lambertian-type WLLEDs are assembled for different positions and distinct orientations along the optical axis in a black cavity. A detailed comparison between results regarding the white light with and without passing through the VSD is offered. The results of this research will help to improve the colorful consistency of the LED lamps which use diffusers.
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Shih-Hsin Ma, Liang-Shiun Chen, Wen-Chao Huang, "Study of CCT varying by volume scattering diffuser with moving and rotating white light LED", Proc. SPIE 9192, Current Developments in Lens Design and Optical Engineering XV, 91921C (25 September 2014); doi: 10.1117/12.2061564; https://doi.org/10.1117/12.2061564
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