We had the 2005 International Year of Physics, and 2009 International Year of Astronomy. Now in 2015, UNESCO has declared that this will be the International Year of Light.
In case you missed it, the APS has made available a series of significant articles and papers related to this topic. Check them out.
Personally, as someone who has performed work at a synchrotron light source, and done studies using photoemission phenomenon, I can truly appreciate "light" beyond just what we normally do everyday.