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As we know sufficient lighting is one of the main hygienic requirements in premises in which people live or work. It is a plus if lamps for artificial lighting emit a sparse light and have a more natural spectrum of emission. However, state-of-the-art lighting devices do give a natural emission of light. «Today even during the day we live in practically biological darkness,» Head of the Sleep Medicine Ward at the St. Jadwiga Hospital in Berlin Dieter Kuntz
He says sunlight on a clear day is equal to 100,000 lux on average. The human body is naturally attuned to such an indicator. Meanwhile, the lighting in most closed premises in the best case scenario does not exceed 100-200 lux. For this reason Kuntz says the future technology of artificial lighting will require finding a way that light emitted by lamps is identical to natural lighting.
«Conversely, at night there should be genuine natural darkness,» the medical expert says.
Indeed, today scholars truly understand the problem of «light pollution» typical in large cities. Street lights, outdoor lighting of homes and memorials, lighting of billboards – light from all such illumination is diffused between particles of dust and smoke that blanket cities in a glow, which has a negative impact on the health of urban dwellers. Street lighting that penetrates bedrooms violates the activity of the epiphysis, a part of the brain that produces the «sleep hormone» known as melatonin in the human body during the night. Medical experts established that not only does it regulate the activity of our «body clock». It also prevents the formation of cancerous tumors.
By the way, sleep and the production of melatonin in the body is disrupted not only when a person sleeps under lights, but also when the wrong lighting of a home is installed. This is about energy-saving lamps that are gradually replacing standard incandescent lamps. The fact is that the tint of their light is different from standard lamps: it can be warm, cold and neutral white. As Kuntz explains in order to light a room during the evening hours it is not advised to use lamps that emit a cold white light as its spectrum just like sunlight contains a high concentration of blue light. A photo pigment in the conus of the human eye keenly reacts to the blue part of a spectrum. «The blue light sends a signal to the human body something similar: «When daylight dawns your body wakes up. So, if you are planning to take a bath before going to bed light up a warm white light not a bright daytime light,» Kuntz explained.Printable version