Output (PPFD) degrades due to LED heating.
After the LEDs have been on for 15 minutes, the output (PPFD) decreased. This is due to the heating of the LEDs. For LED lamp A, the output drops from 98 to 97 micromol. For LED lamp B, the output drops from 94 to 89 micromol. It is important to examine how the LEDs are being cooled to minimize this degradation. From the graphs, we conclude that the cooling technique of lamp A is applied more effectively.
(Source: myledgnd.com)
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