Just as a tip,

Generally with light sources I calculate the post-transform location of 
the light, and simply place it at the calculated spot, with no 
transform.  The vectors that specify the size of the area light get 
scaled and rotated as necessary, and I put the results into the 
light_source statement.

Lighting is generally important enough to merit more direct attention 
than to toss a transform into the light_source {} statement block.

Regards,
John

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