Quote:
Originally Posted by EricH
Signals using the part of the electromagnetic spectrum that is used by wireless communications are specifically banned unless specifically allowed (the FMS signal, basically). Signals using the infrared or ultraviolet parts of the same spectrum run into issues with powered signalling devices.
But signals using the visible part of the electromagnetic spectrum are just fine.
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What about IR spotlights for retroreflective tape?
Also can what about modulated LEDs in the visible spectrum?