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As illumination systems geometries become more complex, and specifications on them more stringent, physical prototyping is becoming more costly. Having the ability to accurately model illumination systems using software can significantly reduce the number of prototypes. Software also allows the user to quickly experiment with different designs which couldn't otherwise be modeled using prototypes. This paper discusses how one would use LightTools, a new 3-D interactive CAD modeling software package which can solve many illumination problems. Examples of illumination systems will be presented showing quantitative illuminance and intensity output.

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