http://www.povray.org/documentation/view/3.6.2/137/

On this page it says:

"It is a good idea to define both things, the light source and the 
looks_like object, at the origin, and then translate them to their right 
place."

However, this is *not* a good idea for parallel light sources. Doing so 
causes the light to emit from the light source's original position (the 
origin) instead of the later position.

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