Simplified modelling methods to design integrative lighting

Evaluating non-visual effects of light is crucial. Designers often use DIALux for this purpose even if it is intended for calculating photopic quantities exclusively. To verify its applicability in this context, two approaches for melanopic equivalent daylight illuminance calculation are compared against measured data. Measurements were performed for 21 scenarios obtained combining 7 wall colours and 3 CCTs. Method 1 adopts traditional DIALux simulations, in method 2 melanopic flux and reflectance replace the corresponding photopic quantities. Method 2 performs better in 71.43% of cases, especially for colours highly reflective in long wavelengths; the opposite occurs for colours most reflective in short wavelengths.