No Glow night vision camera
Comments
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The night-vision LEDs in most IP cameras produce infrared light that is quite close to the visible spectrum (up to 850nm wavelength), and human vision does retain some amount of residual sensitivity at these wavelengths, hence the red glow that is visible around these LEDs that can be quite noticeable when it is very dark.
So, what you want is LED illumination around the 940nm mark, which should be completely invisible to the human eye. So your options are:
1. Find a camera that has built-in LEDs that produce light at this wavelength. There are some, but this may be difficult to find as most cameras either use 850nm or this datum is not specified on their datasheets.
2. Use a separate IR illuminator that produces light at 940nm. But the problem here is finding a camera that you can be sure is sensitive at this wavelength, because many aren't, and again this is often not specified on datasheets.
Perhaps another user who has experience with this can recommend some specific models? -
FWIW, In point (1) not sure about a camera that supports 940nm. (2) I had cameras that had 850nm IRs and hated the "flashlight" effect. I changed all (3) of the camera to non IR, Axis M3026-VE, with the intent to use external IRs. I wanted to avoid the red light effect on the front of the house. I went with an Axton Tactical 940nm IR Illuminator (Axis support confirmed that the camera would "see" the 940nm IR). The 940nm IR only covers about 50% of the distance that an equilvent 850nm IR does so you need one twice the size. These IRs use a lot of power. At the the time it required a separate DC power pannel, today they also support PoE, although you would need a high powered PoE switch. The 940nm IR solution is expensive along with additional cost of a DC pannel or PoE and the time to install them. Although expensive the results are great. HTH
