Kevin Pick, IDA
Chris Luginbuhl, U.S.N.O.
Donald R. Davis, IDA
Wes Lockwood, Lowell Observatory
 

Abstract

We present preliminary results of a survey of outdoor lighting in
Flagstaff, Arizona.

A selection of sites was surveyed in several categories such as
residential, shopping centers, service stations, restaurants, hotels,
etc., and these samples are used to estimate total light output in
each of the categories.

These extrapolated results were combined with accurate inventories
of publically-owned roadway and sports field lighting.  Using
photgraphs of the fixtures surveyed, and average photometric data
for similar fixtures published by manufacturers, estimates are made
of the total light output of Flagstaff as well as the proportions
directed upward and downward.

In preliminary analysis we find that the three principal components -
commercial, public, and residential - contribute similar amounts to
the total uplight.  We find further that the fraction directed upwards
(11%) is similar to that assumed by Garstang, thought the total, in
lumens per capita, (2,100) is considerably greater than his assumed
1,000 lumens/capita.