Introduction: Illumination is one of the most important physical issues in work environment. Lighting is used not only in order to see the objects and do activities, but also as a factor for creating a pleasant work environment. Since daylight can increase performance in students, and it does via improving health promotion, so this study was performed to evaluate the combined lighting of primary schools in Ilam.
 Materials & Methods: This descriptive - analytic study was performed in 1392 in a number of primary schools of Ilam. To select the sample, Ilam was divided to 5 regions. Then just one school with 10 classes was selected of every region, so we had totally 5 schools. In according to pattern of Illuminating Engineering Society of American (IESNA), measured values were entered into SPSS version 16. The obtained results were analyzed using the appropriate statistical tests such as descriptive statistics and Chi-square.
 Findings: The results showed that the lighting quality in 58% of schools was ideal, and 42% had an undesirable situation. The results also showed that 62% of schools had the standard illumination intensity. According to the findings of this study, two factors had the greatest impact on the illumination intensity: the surfaces luminosity, and the quality of illumination. The minimum and maximum lighting intensity values were 303/30 and 875/50 lux respectively.
Discussion & Conclusion: According to the obtained results, the main cause of non-compliance with the standard lighting values can be the southern location of schools, and the ratio of window area to room. It is recommended that to solve these shortcomings, designing in accordance with the standard patterns and also taking more advantages of natural light be carried out.