Minimum Illumination
From X10Wiki
In photometry, intensity of illumination is measured by lux, the International System unit of illumination equal to one lumen per square meter. In practical terms, this measurement says how much illumination is required for cameras to capture images.
Your camera requires 1.5 lux in order to capture a clear image. One lux is equivalent to moonlight while 400 lux is equivalent to office lighting or a clear sunrise. By that comparison we see that the amount of light that the camera requires is minimal. The camera can also be put into Starlight Mode, which requires only .02 lux, so there's no need to turn on the light or make sure you're sitting close to a window just to send out a clear picture.
