Light is essential for humans and plays key role in our lives. After the invention of the light bulb by Thomas Alva Edison in the year 1879, biodynamic lighting is becoming the next big step in lighting evolution. We spent much time in enclosed spaces under artificial lighting that normally lacks the dynamism and biological effect of daylight. Generally, we exposure to lighting that is monotonous both in terms of lighting level and colour temperature, which is not consistent with daylight. The lighting level is kept constant according to standard’s specific minimum value and the light color is determined at the beginning without changing during operation. Biodynamic lighting is characterised by dynamics with regard to light direction, colour temperature and level in order to positively affect vitality and relaxation, mood, visual acuity and productivity.
The term “Circadian” comes from the Latin words “circa,”(about), and “dies,” (day); in other words, “ one day rhythm (“Circadian”). The circadian cycle, also known as the circadian rhythm, or circadian pacemaker, is the daily human biological clock that synchronizes with the daylight. Human beings and their bodily functions have cyclic rhythms.
Circadian rhythm has an influence on variety of biological functions, such as body temperature, pulse rate, blood pressure, tuning the body work or rest, release of hormones, immune function. In order to fulfill the needs of a person in day and night periods, the functions of all body organs according to their features are adapted by the circadian rhythm of brain. “Circadian clock” is also the name of brain function.
Suprachiasmatic nuclei (SCN) is a tiny region of the brain in the hypothalamus and is responsible for controlling circadian rhythms. The suprachiasmatic nuclei, or SCN of the hypothalamus in the brain plays an important role in the daily programming of organismic functions, when natural daylight (approximate wavelength of 460nm to 500nm) is received through the eye.
Another area of the brain known as the paraventricular nuclei, or PVN receives the signals that daylight has been detected from the SCN. Then, via nerve pulses, the signal from the PVN is transferred to the preganglanic sympathetic neurons of the spinal cord which control the activity of the superior cervical ganglia, or SCG. The pineal gland regulates circadian rhythm through secretion of melatonin into the blood by receiving command from the SCG. Human daily sleep/wake cycle and the anxiety of humans are controlled by the secretion or suppression of melatonin.
2002 demonstrated the existence of the special ganglion cells as a third photoreceptor in the retina along side the cones (for colour vision) and rods (for night vision) already known. However, these special ganglion cells are light-sensitive but they are not used for vision.
The control of the biological processes in the body in response to the incident light is the primary role of special ganglion cells. The retinal ganglion cells known as “The Body’s Master Clock” regulate sleep/wake cycles as well as body temperature.
What is “The Body’s Internal Clock”?
Human biology is directly linked with the daily rhythm of the sun. Differences in secretion of the hormone melatonin and cortisol bring about the rhythm of the tuning the body to the morning awakening and daily work or to rest or sleep at night. When the sun rises, light levels increase, the melatonin level in our blood drops and cortisol level in our blood increases.
Cortisol has a balancing effect on melatonin and enables active hours. After sunset in absence of daylight or suitable replacement artificial light , the body will increase the melatonin levels in our blood, as a result of which we become sleepy. Melatonin is a well known neurohormone for causing and regulating sleep.
Sustainable lighting design plays a significant role in reaching sustainability objectives. Due to rising energy costs and the negative impact of energy consumption on nature, it is important to select the most energy efficient lighting solutions in terms of environmental consciousness. Achieving sustainable lighting design is possible with LED light sources and advanced lighting control technologies.
By combining LED light sources and ingelligent lighting control systems , LITPA offers you Biodynamic Lighting Solutions that maximize your energy savings, optimize lighting cost, significantly reduce CO2 emissions, control the body’s circadian rhythms and affect overall wellbeing. Compared to the traditional lighting sources, LED is becoming the most efficient and long lasting technology ensuring users’ psychological and physiological satisfaction. A dynamic ambiance can be created in office, school and healthcare environments by using of intelligent lighting control technologies and daylighting that has positive effects for the mood of customers and staff.
Biodynamic LED Lighting Luminaire
LITPA’s Biodynamic LED Lighting Luminaires (The output of TÜBİTAK 1501-Industrial R&D Projects Grant Program) with pre-programmed lighting cycles as day progresses are produced with highly efficient lighting technology and electronic components for operation.
Multi sensor is implemented in the biodynamic lighting solution in order to maximise efficiency. The multisensor receives user settings from the touchpad and transmit these as well as occupancy and daylight lux data to the controllers on the network.
The touchpad enables users to adjust lighting levels, raise, lower and tilt window blinds, as well as increase or decrease the temperature set-point an integral sensor monitors room temperature at desk level.
Lighting is controlled based upon occupancy and daylight lux data monitored by the multisensor as well as user lighting levels adjusted via the touchpad.
A variety of scenarios where both the level and the colour of the light vary according to what we call the “human rhythm” can be created with the biodynamic lighting system. The automation system itself has different biodynamic lighting scenario programs. These scenarios can be used in areas such as schools, offices and hospitals.