The simulation engine used in this study, the Lightsolve Viewer (LSV), is an efficient hybrid global rendering method which combines forward ray tracing with radiosity and shadow volumes rendering. This algorithm is described in [9]. The engine creates rendered images of daylit scenes and calculates the illuminance on areabased patch sensors. Early validation results indicated that rendered images by LSV displayed a pixel difference of less than 10% from Radiance for a variety of scenes, camera positions, and daylighting conditions [9]. Analysis comparing data collected from area-based patch sensors with point sensors in Radiance indicated similar values with an overall highest difference of 28% [6]. Further improvement and validation of this engine is currently underway.