Illuminance is the total luminous flux (the flux density corrected for human vision) in a given area. The table above is provided in order to get an idea of how ambient light relates to real world environments by comparing the illuminance values for each. It can be seen from this table that proximity sensing applications are required to compensate for a wide range of ambient light conditions. As mentioned earlier, these values represent the visible spectrum. There are IR components that are part of the entire radiant flux in the environment that can interfere with the proximity measurements.