Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: A bit disappointed with night vision, if I buy a 700TV line camera and remove the existing 460 TV Line would I see any better
Document: For the money it's hard to get a better camera. They are much better than the stock units that came in the systems ( although I special ordered my home system with these instead of the normal ones ).Veyr sharp and good night vision.They do have a loud CLICK when switching from day to night vision which Q-See could not help me with.Took one apart and found an easy fix which I'll be glad to share if you needed this resolved.
The cameras are great during daylight but I bought specifically for night vision. Even from short distances, you cannot see images clearly especially not able to distinguish people. Disappointed with these cameras.
I put in an eight camera system and these were add on cameras and have great picture quality during the day and much better than average night vision. 2 days after putting one of these up at the end of my driveway I caught my neighbor dumping trash at the end of my driveway so the camera helped me return the trash to its rightful owner!! !
Excellent TV line rating, same with the picture and color. Easy setup and adjustments. Price was well within range and  customer service was excellent.
Nice cameras, have good color and do well at night. I would highly recommend to anyone looking for decent cameras.
I purchased these to watch my front yard. These cameras work very well. I also have two watching my driveway., Couldn't be happier with image quality. They are hooked up to q-see 4 channel dvr. I didn't want to run a eithernet cable to modem so I purchased a NETGEAR WNCE2001 Universal WiFi Internet Adapter from amazon to connect the modem wireless. Nice system
I have a set for my home, and view them from my cell phone also. They have a very sharp image. Even in the rainy season, quality is great. The 1-800 number has very helpful people...
The cameras was shipped and arrive within a reasonable amount of time. The product was new, exactly as advertised. Great deal
Answer: Can't speak to the 450 but the 600 works great in my restaurant in dark conditions to about 40 ft