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BG111541417 Visible light is between 400–700 nanometers. I hope these are invisible, but from what I’ve read 850nm is not visible light. Regardless of wavelength, if they are visible then that is not good.

2020-07-14 04:36:17 Nuttig (0)
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rodrigoduarte_2 2020-01-09 15:05:08
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