7.20. RMLightSource — RenderMan light source
class RMLightSource(name = "RMLightSource", shader = None)
shader specifies the light shader that should be used. It can either be a
string containing the shader name or a RMShader instance representing
the shader (see section RMShader — RenderMan shader).
The parameters of the shader is made available as attributes of the light source
object. The corresponding slots can be obtained by adding the suffix _slot
to the name.