Keep in mind full color cameras are not magic and still need light, so if you don't have visible light at night, the camera will be blind. You cannot add infrared later as it can't see it.
What is your goal - to IDENTIFY people at the door or 40-50 feet out - one camera cannot be the be all see all. At the door is one camera, 50 feet out is a different camera.
And at 40-50 feet, a 4K camera will not IDENTIFY. You need an optical length of about 34mm and an ideal 4K camera does not come in that.
Our long time resident camera expert Wildcat ran the Dahua 4K/X 8MP 1/1.2" sensor thru the paces. Keep in mind this 4K/X camera is incredible.
He had the 3.6mm version and here is the screenshot from 40 feet in the ideal daylight and standing still, which based on DORI numbers is the supposed IDENTIFY distance for this camera with the 3.6mm lens and I think most of would agree that this is not IDENTIFY quality, even if digitally zoomed in:
I have the 4K/X and 4K/T and they are incredible cameras, but I wouldn't use it for IDENTIFY past 15-20 feet, or half of what the DORI number is.
