Luminance Properties

Renders: Select which render engine you wish to select a material from: RedSDK, LightWorks, or both.
Category: Groups of Luminances such as complex, single, sky, or the name of an open drawing.  See Model Shaders and Applications Shaders
Material: This field depends on the category. For example, if the Category is sky, etc. 
Edit Lumninance: The list of the Luminances available in the selected category. 
Available In: Shows which of the render engines have definitions for the selected luminance.
Load to render luminance only: If on, the geometry of the luminance object is hidden and only the illumination effects are shown.
Edit... Opens the Render Manager.