Lux and Sensitivity

Camera sensitivity is expressed in lux. It's the minimum amount of light needed for acceptable results.

This table gives an indication of the amount of light:

  • A sunny day: 100.000 - 130.000 lux

  • Daylight, indirect sunlight: 10.000 - 20.000 lux

  • Cloudy day: 1000 lux

  • Office: 400 lux

  • Very dark day: 100 lux

  • Dusk: 10 lux

  • Dark dusk: 1 lux

  • Full moon: 0,1 lux

  • Quarter moon: 0,01 lux

  • New moon, no clouds: 0,001 lux

  • Cloudy night, no moon: 0,0001 lux

  • A regular CCD camera has a sensitivity of 1 lux. That gives you even in a dusk setting usable images, with all the aspect of such a setting. Infrared cameras are often rated as 0 lux. This is correct, since the camera needs no other light apart from the infrared light it produces itself. However, the image sensor inside is still 1 lux.

    Note that there are large differences in lux when you compare day (100.000 lux) and night (0.1 lux). This can be explained because we apply a logarithmic scale. The difference between 1 lux and 0,1 lux suggest a factor of 10x, but for us humans it is only a factor of 2. Do not focus too much on lux value alone. A camera of 1 lux or 0.8 lux makes no difference at all in practice. However, a factor 10, or 100, or 1000, yes that can make a difference indeed.


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