Seoul Semiconductor’s LED SunLike Improves Eye Health and Sleep Quality, According to Clinical Study

Semiconductor Co., Ltd. (KOSDAQ 046890), a global market leader in
LED (light emitting diode) design and manufacturing, announced that a
research has shown that its “SunLike”
is an optimized LED for human centric lighting that improves eye health
and sleep quality.

This press release features multimedia. View the full release here:

SunLike spectrum that lowered the blue light peak, which is an optimized LED for human centric lighting (Graphic: Business Wire)

The research team of Biomedical Information Laboratory, Seoul National
University College of Medicine in Korea, has reported that using SunLike
based lighting, the eye discomfort is significantly reduced and the
sleep quality is improved compared to conventional LED lighting users.

The researchers conducted experiments on adults including graduate
students at Seoul National University, who spend a lot of time studying
at their desk indoors. Each participant was instructed to use SunLike
desk lamp and conventional LED lamp for 3 hours before bedtime. The team
conducted a questionnaire and analyzed the vital signs of participants
recorded during sleep.

Subjective evaluation through questionnaires showed a significant
decrease in eye fatigue and a marked improvement in sleep quality. The
researchers found that improvement of the feeling of not refreshing
after a sleep in the following morning was statistically significant.

As a result of analyzing the measured vital sign, the time it takes to
fall asleep is 23% faster and the time to break during sleep was also
improved by 43%. Therefore, the research team found that sleep
efficiency as an indicator of sleep was significantly improved from 88%
to 94%.

“We conclude that these effects are due to the stabilization of the
autonomic nervous system rhythm, which is manifested by inactivation of
sympathetic nerve and activity of parasympathetic nerve by SunLike based
lighting,” said the research team of SNU. “Light affects people’s
circadian rhythm. In order to improve biorhythm, we can adjust the light
according to time zone and use a light source close to sunlight,” said
the research team of SNU.

is an advanced light source that combines the latest optical and
compound semiconductor technology of Seoul Semiconductor and *TRI-R
technology, a sunlight spectrum reproduction technology, that is a
registered trademark by the Toshiba Materials Co., Ltd. It that lowers
blue light peak similar to sunlight spectrum contributes to maintaining
a stable human circadian rhythms and enhancing the color clarity of

In addition, as a result of analyzing the blue light emitted by the LED
‘SunLike’, it received Eye Safety Certification for level RG-1, the
highest level of safety, from Korea Testing & Research Institute last
November. This is the level given to a safe light source without any
photobiological hazards.

“Since its launch on June 29th, last year in Frankfurt,
Germany, with Toshiba Materials Co., Ltd., SunLike has being supplied to
global customers in US, Europe, China and Japan that manufacture home
lightings, smart desk stands and lamps. It is also currently working on
more than 200 projects for SunLike with customers, suppliers and
researchers,” said Minsoo Son, marketing vice president of Seoul
Semiconductor. “We will prove SunLike is the innovative LED which adds
value for human centric lighting by demonstrating differentiated quality
and competitiveness to exceed customers’ expectations.”

*TRI-R, supported by Toshiba Materials, finds in the definition “The
light closest to the sun for human well-being” as its original concept.
The sun light spectrum is developed by the same company and can be
reproduced by a white LED light source technology.

About Seoul SemiconductorSeoul Semiconductor develops and
commercializes light emitting diodes (LEDs) for automotive, general
illumination, specialty lighting, and backlighting markets. As the
fourth-largest LED manufacturer globally, Seoul Semiconductor holds more
than 12,000 patents, offers a wide range of technologies, and mass
produces innovative LED products such as SunLike – delivering the
world’s best light quality in a next-generation LED enabling
human-centric lighting optimized for circadian rhythms; WICOP – a
simpler structured package-free LED which provides market leading color
uniformity and cost savings at the fixture level, providing high lumen
density and design flexibility; NanoDriver Series – the world’s smallest
24W DC LED drivers; Acrich, the world’s first high-voltage AC-driven LED
technology developed in 2005, including all AC LED-related technologies
from chip to module and circuit fabrication, as well as multi-junction
technology (MJT); and nPola, a new LED product based on GaN-substrate
technology that achieves more than ten times the output of conventional
LEDs. UCD constitutes a high color gamut display which delivers more
than 90% NTSC. To learn more, visit

View source version on

Leave a Comment