In all cases, DLC must evaluate the worst case performance of a product's different operating modes, as the Technical Requirements for each category are minimum performance requirements. Due to design complexities of SSL luminaires and the many variables that could affect each performance metric with a minimum requirement, it is difficult to prescribe what worst case will be for all product variations. It is the manufacturer's responsibility to identify the worst case operating mode of the product for each performance metric requirement and provide the appropriate test data.
Our understanding of the technology has led us to expect certain operating modes and design choices to be worst case. Power factor and THD are expected worst case at 277V, while photometrics (specifically efficacy) are expected worst case at 120V. This does not necessarily hold true for all luminaire designs, so a manufacturer may submit independent test data for a different operating mode if accompanied by a technical rationale and supporting data (independent or in-house).
When submitting applications for products utilizing universal drivers, be sure to test at the appropriate operating mode for both photometric and electrical measurements.
Power factor and THD requirements:
Requirement Tolerance Actual requirement
Power factor ≥ 90% (0.9) 3% (.03) ≥ 87% (.87)
Total Harmonic Distortion