Please note that this is a scanned copy of a paper originally published in 1998, so the text is not as clear as in documents created as pdf files. You may need to enlarge certain parts in order to read the subscripts in the equations. Daylight is an essential component of a visually attractive and energy efficient atrium building. Good control of electric lighting is vital for energy efficiency. Areas surrounding the atrium can suffer from poor penetration of natural light unless care is taken in design. Solar shading also needs to be considered. This paper explains the issues involved and gives guidance. It should be of interest to architects, engineers and their clients. It includes a section on the light requirements of some popular indoor plants. 8 pages.