Hello, I would like to share my questions considering a recent dialux study. After delivering my study that was created with the default reflectance factors (70% ceilings, 50% walls, 20% floors), and after the execution of the project, the client measured the lux levels and in some cases they were almost 40% higher than the study's. The actual floor of the project was white tile, very reflective. Are these differences justified? If yes, who would be more responsible to inform me about the real reflection of the material that was used? And in that case, since the clients wants to be so accurate, what other parameters I have to ask from him?

Thank you