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The International Day of Light : a United Nations Program

16 May | The International Day of Light

The International Day of Light (IDL) is an annual, global initiative that provides a focal point for the continued appreciation of light. IDL aims to raise awareness of the critical role light-based technologies play in our lives, elevating science, technology, art, and culture to help achieve the goals of UNESCO – education, equality, and peace.

See event photos from 2019 celebrations around the globe.

The inaugural event occurred 16 May 2018. Learn more.

Apply now for an SPIE IDL Micro Grant to help celebrate IDL in 2020.

The SPIE International Day of Light Photo Contest

See the Winners of the 2019 SPIE IDL Photo Contest

The SPIE Annual International Day of Light Photo Contest aims to raise awareness about IDL and the vital role that light and light-based technologies play in daily life.

See the winners of the 2019 contest!

Promote the International Day of Light

Download the Official Logo
Access SPIE IDL Resources


Photonics for a better world
Photonics for a Better World
Read more about the altruistic endeavors of SPIE on the Photonics for a Better World blog, updated weekly to showcase how our community is building a better world through the application of optics and photonics.
Read the blog  



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Help translate IDL promotional materials for global use.

Fill out our volunteer form, let us know what languages you speak fluently, and we will follow up with you.