Misconception Disrupts the Biological Clock of the Human Body!


ZEVE Lighting (1), which has won many international awards for its architectural lighting projects and has also signed the lighting design of the Presidential Complex, emphasized that erroneous approaches to indoor and outdoor lighting negatively affect human psychology and physiology. Dr. According to Fikret Talu, misuse of light invites many health problems from cardiovascular diseases to diabetes, cancer to hormone disorders…

Within zeve Lighting Design Studio , which he co-founded, dr. Fikret Talu says that lighting that is not applied with accurate calculations in indoor and outdoor environments disrupts the biological clock of the human body due to negative effects such as exposure to excess light and incorrect color choices. The deterioration of the biological clock can lead to many health problems, especially the increased risk against certain types of cancer, from sleep disorders to poor performance, cardiovascular diseases to diabetes.

"Research has revealed that our eyes are not only our gateways to the world, but also our sensory organ, which is closely related to and deeply affects our psychology and physiology," he said . Fikret Talu adds: "Apart from the photoreceptors that allow vision in our eyes, new photoreceptors called light-sensitive retinal ganglion cells (ipRGC) have been identified, which affect the circadian rhythm, neuroendocrine and neurodevolent systems of the body. With these researches, the effects of lighting on human psychology and physiology have also been proven. That is, indoor and outdoor lighting directly affects our physical and mental health." "The next generation of lighting should be human-oriented…" In humans, as in all living things on Earth, almost all physiological and behavioral parameters contain a certain order.

Synchronization between the light from the environment and the biological clock is of great importance for the effective and appropriate functions of the body. In case of deterioration of circadian rhythm, many diseases such as impaired sleep patterns, poor performance, cardiovascular diseases, diabetes, changes in hormone levels, body temperature changes, blood pressure and increased risk to certain types of cancer may occur.  Fikret Talu, who stated that we experience the negative effects not only of the lighting we use in our homes and offices, but also of the outdoor lighting used in current and historical architectural buildings, emphasizes that all these developments lead to the emergence of the concept of "human-oriented lighting": "Human-oriented lighting explains the connection between health and comfort and on the other hand, it meets the circadian rhythm of users while meeting visual and emotional needs. harmoniously balances your physiological needs. Therefore, as Zeve, we carry out all our lighting projects with the principle of human-oriented lighting."

"This makes it increasingly complicated to design a good lighting environment, while putting people at the center of lighting design," said Zeve Lighting Design Studio Co-Founder Dr. Fikret Talu continues: "Traditional architectural lighting focuses on issues such as visual perception of space/structure, brightness and glazing control, color return, safety, light pollution and energy efficiency. However, the non-visible effects of lighting, such as biological clock and wakefulness, include different measurement targets. This requires lighting designers to set a different measurement method and goal than traditional architectural lighting design."

Light and mood are directly proportional…

The Lighting Research Center (LRC) at the Rensselaer Polytechnic Institute, which is located in the U.S. and works to develop measurements and tools for the understanding and application of circadian light in the real environment for lighting designers, has developed the Circadian Stimulus (CS) measure, which plays an important role in healthy building lighting design, dr. Fikret Talu concludes by emphasizing that CS measurement valuations are rated between 0.1 and 0.7 taking into account light level, color, timing, exposure time and previous light exposure times in the CS definition that should be in the environment: "Situations where the CS value is greater than 0.3 have been identified as the most effective values for stimulation of the circadian system. In research with Alzheimer's patients, office workers, young people and healthy elderly people, exposure to CS of 0.3 or more for an hour in the early morning is effective in stimulating the circadian system and shows us that light is associated with sleep, behavior and mood."


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