The specular highlight on the spheres is probably the reflection of the
bright spot on the sky sphere.  It can be made smaller by changing the color
map component [.9 color <.2, .3, .4>] to something like [.98 color <.2, .3,
.4>].  There are still some artifacts in the shadow that could probably be
reduced by increasing the count or reducing the error bound.  Excessive
brightness can be reduced by lowering the radiosity brightness when you add
a light source.

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