Background and effects

It is documented that lighting affects the production of the sleep hormone melatonin which has great importance to our circadian rhythms. The most effective lighting to suppress melatonin production for increased alertness, is light at wavelengths within the range of 460-480 nanometer. Fig. 3-5 shows that the PINEA luminaire has a spectrum closer to natural skylight with more intensity in the range 460-480 nanometer.

The royal gland or glandula pinealis produces the sleep hormone melatonin based on impulses from the brain center for circadian rhythms and biological clock (SCN in Hypothalamus). In a fascinating interaction by nature this center gets impulses from specific ganglion cells on the retina (ipRGC) which then again is influenced by the light spectral composition. It is of importance for the PINEA solution that although this melanopsin-containing ganglion cells are distributed over the entire retina, the most sensitive are in the lower and nasal areas.

Based on this knowledge, the University of Oslo (UiO) participates in the work of documenting short-term and long-term effects of PINEA

In February and November 2018 a pilot experiment was conducted by UiO. 24 persons between the age of 19-20 years participated in the experiment. After spending one hour in a dark room with candle lights, each person was placed in an office for three hours.  Half of these offices were equipped with ordinary LED light luminaires (control group) and the other half with PINEA LED light luminaires (experiment group). The melatonin level was measured each half hour by a salvia test, the first time at 9 o’clock PM (21.00) and the last time at 12 o’clock PM (24.00).

The results showed a steady increase in melatonin in the control group throughout the measurement period. In the experiment group, a decrease in salvia melatonin was observed the first hour followed by a gradual increase in salvia melatonin towards midnight.

Fig. 6: Results from a pilot experiment with 24 persons in February and November 2018. The numbers on the X axis indicate test points every half hour.

The experiment showed significant results. Thus, the study shows that PINEA has effect on melatonin level. The research carried out forms the basis for future studies of long-term effects of PINEA.