Abstract
This study analyzed the variation of the correlated color temperature
(CCT) of white light, which was emitted from Lambertian-type LEDs, and passed
through a volume scattering diffuser (VSD). The tested VSD, fabricated by
mixing scattering particles (PMMA) in glue (epoxy), exhibited various concentration
weights of the scattering particles. Measurements showed that the CCT values
decreased and the CCT variations exhibited oscillatory behavior, as the concentration
of scattering particles increased. Furthermore, the results regarding CCT
variation demonstrated that a higher CCT source is more sensitive to the concentration
than a lower CCT source is, suggesting that the power loss of shorter-wavelength
light is greater than that of longer-wavelength light, when the light passes
through a VSD.
© 2014 IEEE
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