An item in the specifications stating the lowest light level at which movies can be recorded, defined as the amount of light (measured in lux, or lx) needed to produce a video signal with a white level (100 IRE) of ½. The item in the specifications will include the aperture, sensitivity (gain), and shutter speed (frame rate). “Illumination” in this case refers not to the light source but to subject brightness; If "minimum illumination"is not clear, you may translate it as “minimum subject illumination”.