The „Green Lighting“ project, started in 2006 at the Solar Energy and Building Physics Laboratory of Ecole Polytechnique Fédérale de Lausanne (EPFL), explores different ways to combine modern day- and artificial lighting technologies. The main objective of the project is the development of energy-efficient integrated solutions which minimize the electric lighting load while maximizing the building occupants’ visual comfort and wellbeing. This article gives on overview of recent developments within the project’s framework. It comes to the conclusion that lighting power densities of less than 5 W/m² are already achievable in today’s office rooms, provided that daylight is used intensively.