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IR" LED drive 24 are linked to LED's 16 and 18 respectively. 26 is arranged to actuate LED drives 22 and 24, and hence LED's sixteen and 18, in accordance with a predetermined alternating sequence interspersed with dark intervals. During each such darkish interval, the timing unit 26 deactivates the LED drives and therefore deactivates both LED's. Thus, the LED drives and LED's present alternating pink and infrared illumination, whereas the timing unit periodically interrupts this illumination to offer the darkish intervals. 34 can also be supplied. 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