The real 'trickery' going on here is that the Cliffs' are responding to reflected (scattered, to a great extent) radiance in a part of the electromagnetic spectrum (the infrared region that technically starts beyond the visual 'reds') that your eyes cannot! IOW, the colors that your eyes see are not those that a Cliff sensor emits as a series of timed pulses.crypted wrote:... seeing it work on an identical door mat at our other door without problem made me doubt that as the underlying cause. ...
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