Spectrophotometer system, characterized in that it comprises: - an opaque housing, - at least one light-emitting diode configured to emit, at a first wavelength, what is called native light radiation, which is scattered or not scattered, said housing enclosing: - an optical device that comprises: ∘ a jacket that is opaque to all wavelengths, defining an internal space that is closed with respect to an external space, said at least one light-emitting diode being placed in said internal space so as to emit said native light radiation into said internal space, ∘ a first aperture and a second aperture, which extend through said opaque jacket, ∘ a first optical fibre connected to said first aperture and a second optical fibre connected to said second aperture, ∘ said first optical fibre and said second optical fibre each comprising an entrance located in said internal space and an exit that opens into said external space, and being arranged to collect some of the native light radiation emitted by said at least one light-emitting diode, without any intermediate optical device, and to guide without interruption a first light beam and a second light beam, respectively, each of which is obtained directly from said native light radiation, from the internal space to the external space, - a first detector placed to receive the first beam, - a second detector placed to receive the second beam. - an opaque housing, - at least one light-emitting diode configured to emit, at a first wavelength, what is called native light radiation, which is scattered or not scattered, said housing enclosing: - an optical device that comprises: ∘ a jacket that is opaque to all wavelengths, defining an internal space that is closed with respect to an external space, said at least one light-emitting diode being placed in said internal space so as to emit said native light radiation into said internal space, ∘ a first aperture and a second aperture, which extend through said opaque jacket, ∘ a first optical fibre connected to said first aperture and a second optical fibre connected to said second aperture, ∘ said first optical fibre and said second optical fibre each comprising an entrance located in said internal space and an exit that opens into said external space, and being arranged to collect some of the native light radiation emitted by said at least one light-emitting diode, without any intermediate optical device, and to guide without interruption a first light beam and a second light beam, respectively, each of which is obtained directly from said native light radiation, from the internal space to the external space, - a first detector placed to receive the first beam, - a second detector placed to receive the second beam. - an optical device that comprises: ∘ a jacket that is opaque to all wavelengths, defining an internal space that is closed with respect to an external space, said at least one light-emitting diode being placed in said internal space so as to emit said native light radiation into said internal space, ∘ a first aperture and a second aperture, which extend through said opaque jacket, ∘ a first optical fibre connected to said first aperture and a second optical fibre connected to said second aperture, ∘ said first optical fibre and said second optical fibre each comprising an entrance located in said internal space and an exit that opens into said external space, and being arranged to collect some of the native light radiation emitted by said at least one light-emitting diode, without any intermediate optical device, and to guide without interruption a first light beam and a second light beam, respectively, each of which is obtained directly from said native light radiation, from the internal space to the external space, ∘ a jacket that is opaque to all wavelengths, defining an internal space that is closed with respect to an external space, said at least one light-emitting diode being placed in said internal space so as to emit said native light radiation into said internal space, ∘ a first aperture and a second aperture, which extend through said opaque jacket, ∘ a first optical fibre connected to said first aperture and a second optical fibre connected to said second aperture, ∘ said first optical fibre and said second optical fibre each comprising an entrance located in said internal space and an exit that opens into said external space, and being arranged to collect some of the native light radiation emitted by said at least one light-emitting diode, without any intermediate optical device, and to guide without interruption a first light beam and a second light beam, respectively, each of which is obtained directly from said native light radiation, from the internal space to the external space, - a first detector placed to receive the first beam, - a second detector placed to receive the second beam.