@shaker I'm a little confused. It sounds like you have low lighting conditions and your Samsung cameras switched to IR (black and white) because of the low lighting - is this a problem - do you always want daytime color?
1. Did your old cameras NEVER switch to IR mode - were they always in color? If so didn't this result in the ability to see nothing once the lights went out? If you NEVER want the cameras to go into night mode/IR you can set them to "day mode" which will result in 24/7 day mode and no IR.
2. There are a lot of questions in order to make a recomendation also in conjunction with those above.
1. What system did you have?
2. How many cameras do you have? How many do you want with the new system?
3. What types of cameras do you need - where will they be placed or where can they be placed - this will help determine dome/bullet/turret?
4. What is your goal - just observing - or do you want close up in your face ID facial features at certain locations?