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D!ngo
Yea, the matrix IR will eliminate that IR "halo" you are seeing with the ring/cluster of IR in the night vision with your current cameras.
Most people believe "more MP" means "better quality". What this really means is that you are able to enlarge or zoom into an image and retain more detail. Example would be: the ability to zoom into a perps face and get more distinguishing features vs it just bluring out because there are not enough pixels. So, in daytime images - I guess you can safely say "more MP means better quality"... However, there are a ton of cameras on the market that advertise 4mp and still provide a crappy image that's why you want to go with reputable/trusted manufactures that you can find information about, real examples, and has support/warranties in the event you are unhappy. That's one of the reasons this forum is helpful - several people have posted real life examples/captures/snap shots etc from several brands so you can make a decision a little easier. Now everyone has an "opinion" about what is a "quality" image - but that's why I say look at examples and decide for yourself whats acceptable for your application. Also is it important to you to have a US supported product with 2,3,4 year warranty - these are additional questions you need to ask yourself as you design your system.
Now, back to the 2mp vs 3mp vs 4mp night image. This has everything to do with the image sensor on the camera. The 3mp is one of the noisest sensors currently out in the HIK line. The 2mp sensors allow cleaner crisper nightime images. Here is a weblink referenced often in the forum to explain why more MP isn't always better.
http://www.cnet.com/news/camera-megapixels-why-more-isnt-always-better-smartphones-unlocked/
For reference as it relates to HIK cameras: 2mp Best night time, 4mp Better Night time, 3mp good Night time.
Here are some examples for refrence
3MP Matrix IR 4mm (click and go full screen, you can see the noise in the image)
This is acceptable to me for its location as I have entry point cameras should someone approach - this is just more an "over watch" camera
4MP 2.8mm dome - IR OFF
4MP 2.8mm dome
2MP 4mm Dome - IR ON
2MP 2.8mm Dome - Daytime
2mp 2.8mm Dome - IR with security lighting on
3mp Matrix IR
Also keep in mind when you look at examples try to find examples with video or objects in them. The reason is I've seen some people post examples here where they adjust settings on the cameras to give them "better" night images however if there would have been any movement in the image it would have been blury or unrecognizable but they are trying to prove a point in the forum. Seeing examples is key - also look to youtube as you can normally find a lot of example videos there as well. This is why I try to give examples with people or possible moving objects in them so you can tell no games are being played.