Davidm10

Hi, im new and looking for a bit of advice. I currently have a 8 channel Robox Barracuda 1 Dvr with 4 600 tvl cameras with RG59 cable . I was happy at first but now im looking for a bit better quality and more range on the night vision. Im a bit of a novice at this and bought some new cameras from ebay and now im not even sure if they are HD. The cameras I got say 1200tvl on them which I was told was the same as HD is this true? The next problem is I plugged them in and they don't work. The person that sold me them said it was because the old power supply was 3 amp and the new ones required 8 amp as they had new style high power leds for the night vision (The new cameras only have 2 large Leds) Does this sound right? The 3rd question is now that I have researched this am I right in thinking I need to upgrade my DVR to achieve the full benefit of the cameras or will I get away with using the existing DVR? If anyone can help it would be much appreciated as im beginning to wish I never started with this upgrade now . I just thought it would give me something to do over the holidays ... Thanks Again.