Megapixel alone will not help you to capture good images in low light conditions, as the sensor and ISO will also play a major role here. If you are planning to buy the best low light camera, it is better to invest in a product that comes with the effective features required for low light photography. A 15-20 megapixel camera can be enough for the low light photoshoot but you have to look at other factors for a satisfactory outcome.