This study focuses on the development and utilization of an average illuminance calculating software program. The software will be applicable to most general lighting systems. The primary objectives are: 1) to develop a software model utilizing the zonal cavity and lumen method concepts associated with quantitative lighting design, 2) to establish a permanent luminaire data base which will contain luminaire descriptions, CU values, maximum spacing to mounting height ratios, luminaire distributions, and maintenance categories for each included luminaire, 3) to establish a luminaire output report which will enable the user to analyze various luminaire/lamp combinations in an efficient and effective manner.