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Assuming you mean for video work, there are three basic types, which do you mean:
1. Zero lux cameras, usually needing very slow frame rates to allow enough photons to be detected. (fairly expensive)
2. Cameras with photomultipliers, expensive and monochrome only.
3. Cameras with IR floodlighting behind the lens. Very cheap, monochrome when in night mode, limited range (~25m max)