IR illumination means not having to leave a light on. And many cameras come with some type of IR leds built into the camera housing with a light sensor so they turn on when ambient light drops below a threshold. IR leds are low power draw, so on a boat with limited power capacity, that's a benefit.
Many industrial functions use IR to not have light pollution problems and anyone onsite will need a light, which is an easy indicator that someone's onsite...
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