When you say "adaptive" I gather you meant area_light is used. If so, you
need the keyword area_light added to the lights photon statement.
Parallel is recommended for cylinder spot light (through media esp.?) but
isn't required for point sources and area lights.
It could be that the area light isn't projecting toward the sphere as you
had expected. If you could post just the script you are using for that light
source it would help a lot to figure out what you're seeing there.

bob h

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