Question-and-Answer Resource for the Building Energy Modeling Community
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Hi!
I still struggle to find the best set of parameters for lighting simulation! But, yours seem quite "high", so I would expect your results to have converged already, thus my first next guess would be to simplify the geometry.
I am not sure I am reading your facade properly, but if you want to use the 2-Phase Method, I would keep the windows the same, without removing details. The 3-phase method is better when your facade is optically complex (i.e. when there will be a lot of bounces and scattering on when the light goes through your window), not when the shape of the window is complex. Your facade seems to match better the latter case...?
Now, I do not think you need all those details in your geometry. You are calculating the illuminance on a grid and thus you can avoid the trouble of dealing with corners and other complexities. I might be wrong, but I think all those details in your railings may be "absorbing" part of your high parameters. That is, lots of rays get stack bouncing around them without really improving the results on your grid. Maybe try simplifying those and see if you get more stable results.
