Hikvision Low Light (DS-2CD2325FWD-I) vs 4 Megapixel (DS-2CD2142FWD-I)
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Here we have a quick demonstration comparing one of the new 2MP Low Light cameras against a 4 Megapixel one - as you will see the 2mp camera remains in day mode for a good while longer (all be it with noise building up due to the low light as it finally has to revert to night mode)