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A photocell, in terms of IR cameras and lighting, is simply a light sensitive switch that automatically turns the LED emitter bulbs on in the absence of light or off in the presence of light. What makes that beneficial? Well, IR emitters, like any light bulbs, don't last forever. Do not have a photocell and are therefore incapable of turning emitters off. The emitters are then lit constantly- wasting themselves in daylight hours.
No, the nature of the way colors are imaged doesn't allow it. Any time you see or hear the words "color" and "Infrared" in the same camera, it must either have two separate cameras or incorporate the new "dual" imaging chipset technology.
To begin, there really is no camera which can actually 'see in the dark' (pitch dark is referred to as 'zero lux') on its own-though there are a couple larger CCTV cameras out there which come close. So, any camera claiming to do so must be aided either by visible/white or invisible (Infrared) light emitters of some kind. Infrared (IR) assisted cameras are generally found built as a low lux black & white video camera surrounded by LED emitters which cast light at a a frequency outside the visible light spectrum. The visible light spectrum starts at red (then orange, yellow, green, blue, indigo) and ends at violet. Any color you can imagine falls in there somewhere. Light which is outside our visible spectrum is either lower and called "infra" red or higher and called "ultra" violet.
