Question-and-Answer Resource for the Building Energy Modeling Community
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That's insane. Especially with those parameters, which should be rigorous enough to capture the lighting accurately in each case. What is the -ar set to, anyway? And am I correct in saying that you are only calculating the illuminance at a single point? How are you calculating this? i.e., is this a point-in-time calc with glass material for the windows, or part of a three phase? Are you sure the materials are the same for each case, and only the fenestration is changing? Maybe some more details on the "tightly-packed case" elevation would help. If the net glazed area is the same, and in the same position on the elevation, and materials are constant, there shouldn't be such a big difference here.
