Newland EM2039 Series, Руководство по интеграции

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Illumination
The EM2039 has two red LEDs (wavelength: 625±10 nm) for supplementary lighting, making it possible
to scan barcodes even in complete darkness. The illumination can be programmed On or Off.
Since red light is used as illumination and the engine
’s lens imaging system is coated with AR film which
has obvious anti-reflection effect against red light, the engine shows better reading performance on
barcodes printed in non-red colors. For applications involving red barcodes, it is advised to use non-red
supplementary lighting. The user can conduct some tests to determine the proper wavelengths to be
used.