Table 3. Conditions and Rationale of the 6 chosen samples for I-V examination and C-SAM spectroscopy.

Unit #	Test condition undergone by the test unit	White/Blue LEDs	Rationale of the choice	Remarks
1	Power on-condition, tested for 144 hours	White	Maximum degraded sample with 40% lumen depreciation	Tested stopped after 144 hours as LEDs under On condition reached 70% of its initial lumen output, following the ASISST standards13
2	Power off-condition, tested for 144 hours	White	Maximum degraded sample with 2% lumen depreciation
3	Power on-condition, tested for 356 hours	Blue	Maximum degraded sample with 32% lumen depreciation	Tested stopped after 356 hours as LEDs under On condition reached 70% of its initial lumen output, following the ASISST standards13
4	Power off-condition, tested for 356 hours	Blue	Maximum degraded sample with 13% lumen depreciation
5	Power on-condition, tested for 24 hours	Blue	Maximum degraded sample with 13% lumen depreciation	Samples are chosen from the respective sets to observe the effect of MET test before and after “degradation recovery”.