On December 23rd 2013 the United Nations have proclaimed the year 2015 as the International Year of Light and Technologies based on Light (http://www.light2015.org). The members of the portuguese scientific community can not, of course, fail to associate themselves to this important initiative be it through scientific events about light, be it through outreach events for the general public, which highlight the central role that light plays in Technology, Science and Society (http://ail2015.org). The University of Lisbon will thus promote the conference "Light in Physics" (which starts in Portugal the activities of AIL2015 in the University of Lisbon), , the first of a series of mini-conferences which will be organized throughout the year. With the sponsoring of the Rector of the University of Lisbon and the Portuguese Physical Society, this conference will cover the most important subjects of Physics and Technology associated to light. Due to the important role that the presently called Instituto de Investigação Interdisciplinar of ULisboa had in the development and construction of Science in Lisbon and in the country in the past 40 years, namely in many of the scientific subjects related to this international event, the Conference will take place in the Auditorium of this Institute.