Our future is light. Play your part.

The International Day of Light is a global initiative that provides an annual focal point for the continued appreciation of light and the role it plays in science, culture and art, education, and sustainable development, and in fields as diverse as medicine, communications, and energy.

LightDay 2022 Trailer
Watch our LightDay 2022 Trailer

Created by Optica, IEEE Photonics Society and SPIE to celebrate the importance of light in our lives and encourage the next generation to join our field.

20th Anniversary Challenge
Share an idea on how optics and photonics can improve our world.

Celebrate the LightDay 2022 and the Optica Foundation's 20th anniversary by offering an idea for how a researcher could explore using light to solve a provide a solution to a global challenge. A competition for 10, US$100K prizes launches this summer.

Visit opticastore.org
Find tools to teach kids about light

Explore kits to teach kids about optics and photonics in The Optica Store.

Attend CLEO
Attend CLEO 2022

Celebrating the International Day of Light at the world’s premier international forum to learn about innovative advances, research and new technologies from the laser science industry.

Explore OPN magazine
Check out advances in optics and photonics in OPN magazine

Discover recent articles on the impact of light science and technology on society in Optics & Photonics News.

Explore past celebrations
Explore past celebrations

Learn more about the #TrustScience and #SEETHELIGHT campaigns (and more since 2018).

Visit the official site
Visit the official site for the International Day of Light

Explore the content, register an event, stay connected to the celebrations taking place worldwide