Daylighting standards: Do we have the correct metrics?

Daylight in buildings is important in a number of ways and can bring benefits to building users and save energy. There are a number of ways to regulate the quality of daylit environments. The paper studies the way daylight adequacy is controlled in current guidance together with other metrics that are in use. These metrics are compared to developing ideas from the world of electric lighting and a new metric to control daylight adequacy is proposed.