Thanks for all the tips about photons, Alain!

I circumvented the problem with moving the orange spotlight a little bit as you
can see in the new picture. There are no orange spots anymore.

The number of photons shot is 437572, and Surface photons stored is 23058883.
The cubes are about 2 units wide.

I will try a new render over night with the spotlight back at the original
point_at, and with just a spacing of the photons.

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