  The propagation of artificial light into real environments is complex. To
perform its numerical modelling with accuracy one must consider hyperspectral
properties of the lighting devices and their geographic positions, the
hyperspectral properties of the ground reflectance, the size and distribution
of small-scale obstacles, the blocking effect of topography, the lamps angular
photometry and the atmospheric transfer function (aerosols and molecules). A
detailed radiative transfer model can be used to evaluate how a particular
change in the lighting infrastructure may affect the sky radiance.
  In this paper, we use the new version (v2) of the Illumina model to evaluate
a night sky restoration plan for the Teide Observatory located on the island of
Tenerife, Spain. In the past decades, the sky darkness was severely degraded by
growing light pollution on the Tenerife Island. In this work, we use the
contribution maps giving the effect of each pixel of the territory to the
artificial sky radiance. We exploit the hyperspectral capabilities of Illumina
v2 and show how the contribution maps can be integrated over regions or
municipalities according to the Johnson-Cousins photometric bands spectral
sensitivities. The sky brightness reductions per municipality after a complete
shutdown and a conversion to Light-Emitting Diodes are calculated in the
Johnson-Cousins B, V, R bands. We found that the conversion of the lighting
infrastructure of Tenerife with LED (1800K and 2700K), according to the
conversion strategy in force, would result in a zenith V band sky brightness
reduction of about 0.3 mag arcsec-2.
