Hello Bald Eagle,
Thank you for your comments, this might be of interest only if I manage to model
physically realistic optical scenes. According to laws on physics, geometrical
optics in particular.
So far it does not look like it maybe because I am not using it correctly?
If I specify beamwidth of certain angle it should result in spot of light of
certain size at certain distance. If angle is changes size of the light spot
should change.

So far I do not see it in my models.

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