This document was revised to update various references and fix small typographical errors. In addition, Section 7.1 “Photometric Design Guidelines” was removed as it was not required.
In addition, Figure 2 had a photometry requirement change of the (0,0) entrance angle value for the 1.5 degree observation angle from a value of 6 to a value of 7. Based on previous history, when the original photometric tables were changed to add the minimum millicandela per incident lux requirements to standardize the document with SI units, the value was rounded down rather than rounded up. This made this particular value incorrect compared to the calculation of the other minimum values using a multiplier to convert the units. This change is minor, however should be noted. The calculation for conversion between SI units and English units has now been included as a note. In addition, a tolerance for the projector light source CCT (Correlated Color Temperature) has been added, which had not existed up to this point.
Additionally, Figures 1A and 1B were added to help demonstrate the concepts of the entrance angle versus observation angle of measurement. Figure 1C was added to describe an acceptable method for measuring the reflected color of a test item by use of a calibrated projector light source and a fiber optic arrangement using a spectroradiometer.
Included in: Ground Vehicle Lighting Subscription Learn More