First, what version of Poser are you using? If poser 7 and above, you could use the mat room for the light. Depends tho, on the way the building's materials are set up. Is there a separate glass mat for the windows? If so, you could use the Ambient setting in the material room. It's on Poser Surface. I don't know how to do the random effect but maybe some of the Poser Mat Room experts here can help or you could play around or experiment with it..

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OS: Windows 11 64-bit
Poser: Poser 11.3 ...... Units: inches or meters depends on mood
Bryce: Bryce Pro 7.1.074
Image Editing: Corel Paintshop Pro
Renderer: Superfly, Firefly

9/11/2001: Never forget...

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Today is the tomorrow you worried about yesterday