rail cameras come in three flash types: white flash, red, or low glow, and no glow. White flash cameras work just like your DSLR, taking sharp pictures in the widest range of lighting, including nighttime. But they tend to scare game. On the other end of the spectrum, no-glow cameras use infrared light invisible to humans and most animals, but the image quality suffers for night photography. In the middle are red- or low-glow cameras, which strike the best balance for hunters.