The Sensor Placement + Optimization Tool, or SPOT™, is intended to help architectural designers and engineers evaluate annual daylighting characteristics of a space, refine and optimize daylighting designs, quantify existing or intended electric lighting performance and help establish the optimal photosensor system placements and settings. SPOT is commonly used as a daylighting design and analysis only engine and can produce a number of daylighting metric reports including several versions of LEED, CHPS national, and a custom SPOT Metric report. SPOT handles both top and side daylight sources, can model optical daylighting systems, automated and manual shade controls and can model any electric lighting source represented by an IES file . Photosensors systems that were included in the testing by the Lighting Research Center (LRC) in the 2007 National Lighting Product Information Program (NLPIP) Specifier Report on Photosensors can be modeled exactly and generic photosensor systems and response can be modeled as well. This technical manual summarizes the various user interface screens of SPOT and describes the available inputs and outputs.