Lighting device with device for regulating the illumination according to the luminance of the illumination field and corresponding use

A device for lighting an illumination field, in particular an operating field, of the type including

• a light source, adapted to light the illumination field
• a device for regulating the illuminance from the light source wherein the device for regulating the illuminance from the light source is adapted to
• (a) receive an actual luminance signal representing the actual luminance of the lighting field and
• (b) control the illuminance from the light source as a function of the actual luminance signal and a luminance set point signal,
• and in that the lighting device comprises a device for determining the actual luminance of the lighting field and to create and transmit the actual luminance signal to the device for regulating the illuminance from the light source, said device for determining the actual luminance comprising two modules for determining the actual luminance and means adapted to detect an obstacle situated between one of the modules for determining the actual luminance and the lighting field, wherein the actual luminance signal transmitted to the device for regulating the illuminance from the light source is that associated with the other module for determining the actual luminance.