Abstract—In this paper, a regular dodecahedron solar simulator
structure with five spot light sources is presented to provide
uniform flux. To analyze light distribution without a dodecahedron
cavity, a cubic cosine relationship between deflection angle
and test flat plane is proposed, and results show that nonuniformity
reaches 5%. By introducing a regular dodecahedron cavity,
nonuniformity can be reduced to2%in a circular areawith an 85%
inradius, according to the Monte Carlo ray tracing method. Based
on the structure, a prototype simulator is fabricated by pentagons
with 4 cm inradius and with five high-power light-emitting diodes
(LEDs). Across the inscribed circular aperture of the bottom light
output pentagon, nonuniformity is 3.1%; while 2% nonuniformity
is reached in a 3.4-cm2 circular aperture whose area occupies 72%
of the inscribed circle.