La temperatura di colore delle sorgenti e la loro eco-compatibilità

(in lingua inglese)

This table shows different important results. First, the Low Pressure Sodium lamp is the best light for the protection of night environment and this should remain the common choice near astronomical observatories even if the color rendition is poor. Cool white lights (T~5500K) thus has an impact 10X greater than Low Pressure Sodium ones. We can see that white light sources, even if we tune down the illuminance levels to keep the same luminance level for public lighting (taken here to be 0.5 cd/m2 in average) in order to have the same visual abilities as high pressure sodium lights while doing some energy savings (which are most of the time really low) lead to an increase in light pollution between 50 and 140 %. We assumed here that road reflectivities is the same for the different kind of spectra lights.