Similar to the editable transforms, lights marked with the edit_ prefix are loaded into a list in Previzion, and can be selected and edited. In addition to translation and rotation, the cutoff angle can also be adjusted. Lights that are operable include Point, Directional, and Spot. These lights will only work on objects shaded with lambert materials. Cgfx shaders can be lit with lights, but those must be written into the shader and are only editable within that shader, and are not linked to the editable lights in Previzion. Cgfx shaders like the PhongBumpReflection shader have these inner-operable lights.
This is particularly useful when writing video projection shaders, discussed in the custom shaders workflow.