Abstract
In the paper, an optical design for a standard light source is proposed
and demonstrated to perform high stability, high angular CCT (correlated color
temperature) uniformity, and adjustable light pattern from a Lambertian-like
pattern to a narrow light pattern with a full-width at half-maximum (FWHM)
angle of 60
$^\circ$
. The optical module contains a color-mixing cylinder, a diffuser,
and an absorbed cylinder. The simulation well predicts the corresponding measurements
and the angular CCT deviation can be kept a certain low level, which is much
lower than a general phosphor converted white LED. In addition, we apply a
pcW-LED of CREE XML as the light source to the optical module to show the
general adoptability of the optical module. The measurement shows that the
similar behavior, with adjustable light pattern from 120
$^{\circ}$
to 60
$^{\circ}$
. In addition, the angular correlated
color temperature deviation (ACCTD) is always kept an extremely low level.
© 2014 IEEE
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