Electrical Circuitry: Limits have been established for laboratory electrical circuitry and equipment. This is intended to improve the uniformity of the electrical measurements taken during testing – particularly when rapid transitions in current are present.
Angular Intervals: The language for defining the angular intervals for goniometric measurements have been more clearly defined. This includes angular measurements of chromaticity for color uniformity as well as integration.
Stabilization Criteria: The criteria for the stabilization of the test subject has been changed from 15-minute intervals to 10-minute intervals. When coupled with a good pre-burning process, this can help to increase efficiency in the laboratory.
Tolerance Intervals: Some metrics such as ambient temperature have been specified using tolerance intervals. This now defines the acceptable range in terms of the allowable deviation combined with the uncertainty of the measurement. The target values have remained the same, but the quality of the laboratory’s equipment and process has been taken into account. This should improve uniformity across laboratories.
LightLab International Allentown, LLC is now accredited to perform this testing. Effective immediately, all testing will be performed in accordance with LM-79-19.