The present book is based on the experience of the author. The
experience is mainly the result of years of research, of consulting
work, and in participation in policy decision making in many felds,
most, but not all, related to outdoor lighting. To some degree, the book
represents the preference of the author. The selection of the subjects
is based on more than 50 years of experience of what is desirable to
know for persons engaged in scientifc research or practical application
in the felds of lighting and vision. The subjects deal with a number of
fundamental aspects. The theorists must have them at their fngertips,
whereas the practical engineers may assume them as known in their daily
work. The selection of subjects is based in part by the questions that
came to the author over the years, but even more by the preference of
the author himself. In this respect, it is a personal book. Thus, it
should be stressed that the book is not a 'handbook' or even a
'textbook'; many subjects that commonly are treated in such books are
not included here. Not because they lack importance, but because the
author feels that they are adequately treated elsewhere. Some relevant
works are mentioned in the References. Over the years, the author has
been engaged in giving courses on vision and lighting, lately more in
particular on Masterclasses on a post-graduate or post-doctorate level.
