https://pages.services/info.longi-solar.com/longi-scores-high-marks-in-recent-module-quality-and-reliability-reports/?
High marks from independent testing labs: But don’t just take our word for it. We work with many of the world’s leading independent testing and certification labs as well.... The test regimens conducted by the labs, which were similar but not identical, included the following:
Thermal cycling
Damp heat
Humidity freeze
Dynamic mechanical stress and durability
Backsheet durability
Potential-induced degradation (PID)
Light-induced degradation (LID)
Light and elevated temperature-induced degradation (LeTID)
UV exposure
Hail durability
Thresher accelerated multi-test sequence
Module efficiency
PAN tests (which evaluate module performance under specific, real-world operating conditions)