When adding the photon section to objects is it better to place the photon
declaration within each small element of a larger complex object or simply
declare the photon statement at the very last one time?  Simplistic Example:

union {
   Sphere {<0,0,0> 1.0 pigment {Red} photons {target reflection on}}
   Sphere {<1,0,0> 1.0 pigment {Green} photons {target reflection on}}
}

or

union {
   Sphere {<0,0,0> 1.0 pigment {Red}}
   Sphere {<1,0,0> 1.0 pigment {Green}}
   photons {target reflection on}
}


It seems faster by using the latter but I'm not sure if there are advantages
or disadvantages of either.  I might be able to see using the former if the
various elements were glass in some and not in others.

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