Seoul’s SunLike Series Natural Spectrum LEDs Adopted by Koizumi

For Children’s Room Lighting to Support Students’ Learning and Concentration


ANSAN, South Korea (JULY 29, 2020) – Seoul Semiconductor announced that its SunLike Series natural spectrum LEDs have been adopted by KOIZUMI Lighting Technology Corp. (“Koizumi”), a traditional Japanese lighting company, for use in lights for children’s rooms and living rooms. SunLike Series natural spectrum LEDs are optimized to support healthy circadian rhythms based on natural sunlight, under which all animals and plants on the earth have evolved over 3.9 billion years.

In designing their children’s room lighting systems, Koizumi has adopted the SunLike Series natural spectrum LEDs, which have been recognized as an innovative technology that produces light that closely matches the spectrum of natural sunlight by a of total ten global lighting awards held in Korea, Europe, China, and US. The SunLike Series LEDs have three beneficial effects in contrast to conventional LEDs: Better Eye Health – protection from myopia in children; Better Study – support for students’ learning and concentration; and Better Sleep – improvement in sleep quality.

Based on the results of a comprehensive sleep study conducted by Professor Christian Cajochen and his colleagues at the University of Basel in Switzerland, LED light sources with the same measured intensity and correlated color temperature (CCT), but different spectral output, can have different effects on human behavior and physiology. The study, published in the Journal of Lighting & Research Technology on March 24, 2019, found “evidence that a daylight [natural spectrum] LED solution has beneficial effects on visual comfort, daytime alertness, mood, and sleep intensity in healthy volunteers.”

According to the results of a study done by the Bio-Information Laboratory of Seoul National University Hospital in July of 2018, SunLike Series natural spectrum LEDs have been shown to reduce eye discomfort and improve sleep patterns.

In addition, Michael W. Young, Jeffrey C. Hall, and Michael Rosbash, the recipients of the Nobel Prize in Physiology or Medicine in 2017, discovered the molecular mechanism of circadian rhythm, which governs biological clock based on a 24-hour cycle that regulates sleep, eating behavior, and metabolism.

Improved sleep has recently has become more important in the midst of the COVID-19 pandemic. Various studies show that high sleep quality can boost immunity, enhancing the ability to resist a particular infection or toxin.

“Our SunLike Series natural spectrum LEDs are an advanced technology that has achieved the highest level of eye safety certification from the International Commission on Illumination as a safe light source with no photo-biological risks. In particular, it helps improve eye comfort and concentration for children,” said a representative at Seoul Semiconductor. 

Introduced in June 2017, the SunLike Series natural spectrum LEDs are an advanced light source that combine the latest optical and compound semiconductor technology of Seoul Semiconductor with Toshiba Materials’ TRI-R technology. TRI-R, supported by Toshiba Materials, finds in the definition “The light closest to the sun for human well-being” its original concept. The sunlight spectrum is developed by the same company and can be reproduced by a white LED light source technology. TRI-R is a registered trademark by the Toshiba Materials Co., LTD.

SunLike Recognitions

12018Mar.Product of the Year Award 2018from Elektronik MagazineEU
2Apr.The Top 10 MUST SEE Products at 2018 Edison AwardUS
3Aug.Industry Recognition in 2018 IES Progress ReportUS
4Sep.Best Application Technology at LpS Award 2018EU
5Oct.Top 15 Engineering Technologyby the National Academy of Engineering of KoreaKR
6Nov.The Most Creative LED Technology Awardin OFweek China LED Lighting Awards 2018CN
7Nov.2019 “Top 10 Product” for Sustainable Constructionfrom BuildingGreenUS
8Nov.Enabling Technology of the Year at Lux Award 2018EU
92019MayA Winner of the Lighting Solutionat German Innovation Award 2019EU
10Jun.Korean President’s Awardat International LED EXPO 2019KR

For more information, please visit