In this article the author analyzes quality parameters of the ergonomic lighting systems and forms a model of an ideal indoor lighting. Based on the literature review and author’s measurements of the natural daylight, the model’s principal features are 1) dynamic spectrum and 2) dynamic color temperature. The model prescribes these parameters to follow the characteristics of the natural daylight in the course of a day and throughout the year. The relevance of these parameters and the connection to human wellbeing is argued in support to the model.