An LM-80 test report documents standardized testing of LED components (packages/modules) to measure lumen maintenance (light output retention over time). Conducted per IES LM-80-15, it tracks lumen depreciation under three temperatures for at least 6,000 hours (often 10,000+). The data, combined with IES TM-21 projections, estimates LED lifespan (e.g., L70, when output drops to 70%). It validates LED reliability but does not assess full luminaire lifespan, serving as a critical benchmark for industry performance comparisons.