Yeah after reading the sensor section that became clear to me. When I first found the siteTry searching Empiretecandy on this forum--his name is Andy. He's the vendor of choice for many of us here...highly respected/trusted. I bought all my Dahua cameras through Andy.
And ditto on what the guys said above...you WANT the low light cameras with the biggest aperture you can afford. The Dahua 5442 is an excellent affordable option.
i thought it was odd everyone bought from a member here so just glanced over it, but I ended up going through his posts and others and plan to buy my starlights from Andy. As long as I can figure out how to get my router and 2nd NIC setup correctly for BI.