Paulina Komorzycka
supervisor: Piotr Pracki
General interior lighting should be neither overly directional nor overly diffused. Providing the right balance between directional and diffused lighting allows you to eliminate undesirable effects, such as too strong shadows (modeling is then too strong) or to create too monotonous lighting environment (modeling is then too weak). One measure used to assess the effect of the directionality of lighting in the interior is the Cubic Modeling Index (MCU), which is the ratio of the illuminance vector to the illuminance scalar at a point on the reference plane. Research shows that obtaining the required interior modeling index is significantly limited. The study considered the influence of the room size (RI), the reflection coefficients of the main surfaces in the interior (RO), the lighting class of the luminaire (CL), the semi-spatial lower light distribution of the luminaire (LID) and the arrangement of luminaires (SH) on the value of the modeling index. A total of 432 lighting situations were simulated in the DIALux program. The analysis of the results showed that the parameter having the greatest impact on the value of the modeling index is the arrangement of the luminaires. Due to the use of the multiple linear regression model, equations describing the relationships between the dependent variable (the value of the modeling index) and the explanatory variables (RI, RO, CL, LID, SH) were obtained. Knowledge of these equations allows you to verify the suitability of lighting fixtures in terms of producing the desired modeling effect in interior lighting already at the stage of developing the lighting concept.