ABSTRACT
We start by reviewing some basic principles and definitions related to lighting. The various sources of electric light and the effect of luminaires that house the lamp are discussed. We then treat daylighting (or natural lighting) covering some basic notions and a description of how to perform a daylighting design calculation using a simple method known as the lumen method. How to apply the method to both toplighting and sidelighting is discussed along with illustrative examples. In the last section, we examine the electric energy savings achievable in commercial buildings with proper daylighting design. Several case studies are described in order to illustrate this important energy efficiency option.
