"Since the 1974 Meeting in New York at the UN for "A design without barriers" and after several recommendations, resolutions and laws (Álvarez, Amengual & Benito, 1996) accessibility has been introduced as a key concept for the adaptation of public buildings for disabled people. However, only a few number of those documents (Martínez, 1994; Real Decreto 486/1997; AENOR -UNE 41500-, 2001; CIE - 123-, 1997) introduce illumination as an accessibility parameter, without considering the visually impaired. These documents recommend different illumination levels for main halls, corridors, rooms, etc., that rise with the difficulty of the visual task commonly required for using a certain space, considering visual tasks varying from passing through a hall or corridor, to tasks with a medium visual level requirement like detecting, reaching and using objects."