Designers of lighting systems are often faced with wide
variations in the presentation of luminaire photometric
test data. Designers also occasionally find that the
calculated values do not agree with measured values.
This discrepancy can be attributed to a number of factors.
Some of the common problems, such as improper
installation methods, can be identified on site and corrected.
However, discrepancies in photometric performances
are often attributed to out-of-date test reports,
manufacturing defects, component tolerances (lamp,
ballast), and improper prorating during calculations.
Therefore, it is necessary to establish more-consistent
presentations and verifications for luminaire
photometric data.
This document provides recommendations to luminaire
manufacturers for uniform presentation of test
reports of printed or electronic roadway luminaire
photometric data. For large installations, it recommends
consideration of random sampling of luminaires
for photometric testing, and it recommends
procedures for prorating photometric test results
for calculations where applicable. This Technical
Memorandum (TM) does not specifically address
computer programs that are used to read and supply
formatted electronic photometric data.
| Edition : | 1st |
| ISBN(s) : | 9780879953805 |
| Number of Pages : | 24 |
| Published : | 10/18/2017 |
