Photometry of Floodlights and a Light Pollution Diagnostic

Enrique Piraino D.
Escuela de Ingenieria Electrica
Universidad Catolica de Valparaiso, Chile

One of the major sources of light pollution of the sky are floodlights.
These are generally provided with large lamps which are aimed over
the horizontal, causing a great amount of lumens to travel directly into
the sky.

Photometric data help lighting engineers and designers take care of
this situation. A specific photometric reference system, B-Beta, is
suggested in order to facilitate the determination of the maximum
allowed aiming angle. The system should be used even for those
reflectors that present rotational distribution..