Really Basic Question about Light Shaders

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Hello All,

So I'm fairly new to Houdini and Renderman in general. I'm now working on my second Houdini project and I'm interested in using some Renderman Light shaders. My basic question is, how/where do light shaders get implemented? My initial thought was that the shader would somehow be referenced by a spot that I created in the scene but that doesn't seem to be right. Secondly, through my readings of Renderman, most of the books talk about translating a light source by moving the coord system. I was assuming that was when you were rendering directly from a rib, not within houdini? Am I wrong? Do I really have to code the light's position to place it into my scene? Clarifications appreciated!

Terror.
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