1 Lux = 1 Lumen/m2
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Quick tutor about inherit a 3D object’s coordinate system in maya.
“Put it into his center”
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Ivo3d's official website 
CTRL+g, Select child, Select parent, CTRL+p, Select Child, Reset transforms, CTRL+P, CTRL+G
There are a simpler way to do that:
Just use from the constraint menu> parent constrain, without maintain offset option, then freeze transform, and delete the constrain:)