EDIT- I was testing the camera by putting it in a chair and pointing it out of my window. I realized that the column on the front porch was capturing the light and not allowing me to see anything past that. Once I tested it somewhere else I was able to see much further. I may not be able to make out the person's face from far away but if you're using it to alarm you by email when motion is detected that someone is creeping around your back yard this works well. Up close you are able to get a good look at the face. I did return the system so I can test better cameras and a better DVR to see if it's worth spending double what the Swann costs.
Unfortunately all the lights on my house were removed because we're painting and we haven't installed the landscape lights yet. I'm testing Swann PRO 640 and 760 which both have 24 IR LEDs and are 600 TVL and 700 TVL respectively. At night you only get a clear image if you're a few feet away from the camera. If you are 30 feet from the camera it's just a faint image in the distance. I wonder how much of a difference it will make once the lights are installed. They state the night vision distance is 65 ft and 98 ft respectively but I don't know if that means in a well lit area or no light. It must be a well lit area.
Qvis was suggested here so I looked at the P400-E37-V2G40-N. It has 48 IR LEDs and is 650 TVL. It's cheaper than the Swann 760 at $84 versus $150 so that is confusing to me since it's supposed to be a better brand.
What do you suggest is a good number of IR LEDs and what other factors do I need to look at besides the TVL?
http://www.swann.com/s/products/view/?product=1366
https://securitycameraagent.com/files/P400-E37-V2G40-N.pdf