IR beams in combination with car cam.

I found this website where all kinds of IR leds are sold, up to many 100's of Watt for military use.

Few notes: "With the 850nm, user can still see a bit of red around the LED bulb when positioned at the correct angle. Whereas 940nm is completely invisible to the naked eye."

(Pio) Fri Jun 3 12:24:35 2011
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