iENA 2015

Effectiveness, vitality, relaxation, simply the right light


how color temperature influences our well-being

Cold white natural light in the range of > 5500K reduces the production of melatonin, but increases the production of cortisol and serotonin.

High color temperatures of > 5500K have an activating effect on humans and low color temperatures < 3000K help to relax, and induce sleep. explains how Human Centric Lighting (HCL) works and how it promotes health and wellbeing (short version about 3:52 minutes).


Fully automatic CCT

Depending on the time of day, season and geographical location: during daytime SundailLED produces cold white light. With sunset the color changes to warm white, and vice versa.

Because the color temperature in the evening or at night is reduced to warm white, sleeping patterns will not be disturbed by the positive effect of the cold white light which shines during day time.

SundialLED does not need any internet connection, and no sensors.

For natural CCT adjustment there are no user interactions necessary


SundialLED applications are suitable for indoor as well as outdoor use.



Even in the day, it is often necessary to supplement the indoor lighting with artificial light; either due to insufficient windows or due to weather conditions.

During the day the Central European Sunlight has an average color temperature of about 5700K.



In the evening and at night daylight lamps inhibit melatonin production and thus prevent a natural relaxation and sleep process.

Warm white light with less blue light does not inhibit the production of melatonin and is perceived as much more pleasant and relaxing.

Austrian innovation

Sundial LED is an Austrian, patented invention