Fig. 1. Calculation of reflection factorbetween two points

Fig. 2. Average illuminance error rate and running time versus number of reflection calculations

Fig. 3. Illuminance distribution results of work surface for each case. (a) Case 1, model simulation; (b) Case 2, model simulation; (3) Case 3, model simulation; (d) Case 4, model simulation; (e) Case 1, DIALux simulation; (f) Case 2, DIALux simulation (g) Case 3, DIALux simulation; (h) Case 4, DIALux simulation

Fig. 4. Illumination error rates of each case

Fig. 5. Definition of diffuse reflection parameters

Fig. 6. Error rate of each illuminance value as a function of roughness

Table 1. Cases of light environment model

Table 2. Comparison of average illuminance calculation results

Table 3. Comparison of illuminance uniformity calculation results

Table 4. Comparison of direct and reflected components of light energy

Table 5. Simulated illuminance value and uniformity error after model improvement