求翻译：For Luminescence Tests, two light emitting diodes (LEDs) with different wavelengths are used (C8 and F8). The LEDs are covered with a diffuser and their intensity is electronically controlled. The LEDs have to be switched on by the user and will switch off after the time period noticed in the Nominal Value Sheet of the MultiCheck-Plus test plate automatically. For the crosstalk measurements, additionally empty wells surrounding the LEDs are used (B8, C7, C9, D8, E8, F7, F9, G8).是什么意思？

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