Here is an update to the r&l scripts I posted about earlier. The new update adds the light.py script for adding and editing lights in your scene. When launched it automatically lists all the lights in your scene in rows and allows you to edit individual light's attributes. You can add new lights by clicking the corresponding buttons in the top left of the interface. You can automatically add a basic light set-up that includes directional lights for setting up an interior lighting setup. You can organize all the lights in your scene by having them be grouped in a node called 'lights' at the top-level of your scene. And for spotlights, directional lights and area lights, you can orient them towards a specific object by selecting the object in Maya and then clicking on 'Point' for the specified light.