2. A few reminders of photometry and spectral representations
2.1 Photometric quantities and units
The naked eye, or one equipped with an optical device such as a pair of binoculars or a telescope, is the performance benchmark for all night vision technology solutions. For eyes, it is customary to use photovisual units, whose application is limited to the Visible spectral range. For optoelectronic components, radiometric units are used, or better still, by dividing by the photon energy (§ 2.3 , relation (1))...
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A few reminders of photometry and spectral representations
Different contributors to night-time illuminance
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