Bluelight content

Blue light, especially prominent during the daylight, signalizes to the body the very fact that it is day and not night. Correct content of the blue part of the spectrum as close to the sunlight as possible is vital for human comfort. For environments that do not provide adequate access to daylight the blue light content is especially important to comfort and well-being of workers. Without blue light of the specified wavelength the body starts producing melatonin, which brings about lower attention and makes people more prone to sleep. The absence of the blue part of the spectrum in light can create hazardous conditions in spaces where heavy machinery is operated, like production factories or warehouses. Enough of blue colour in the spectrum makes people less sleepy and more focused.

 

Correct content of the blue part of the spectrum as close to the sunlight as possible is vital for human comfort. As the discovery of the new photoreceptor that influences the production of melatonin by George Brainard shows, the receptor is especially susceptible to the wavelength of 464 nanometers in the blue part of the visible spectrum. From the evolutionary point of view, blue light, especially prominent during the daylight, signalizes to the body the very fact that it is day and not night.

For environments that do not provide adequate access to daylight the blue light content is especially important to comfort and well-being of workers. Without blue light of the specified wavelength the body starts producing melatonin, which brings about lower attention and makes people more prone to sleep. As has been mentioned, the blue light should be ideally coming from above, as the photoreceptors are in the lower part of the retina, therefore reacting better to light coming from the ceiling at specific angles.

The absence of the blue part of the spectrum in light can create hazardous conditions in spaces where heavy machinery is operated, like production factories or warehouses. In the facilities which work in shifts the provision of blue light in the artificial spectrum of the lamp can help adjusting to the nocturnal biorhythm required for working at night. In simple terms, enough of blue colour in the spectrum makes people less sleepy and more focused. The same goes for mammals, which react to almost the same wavelength as humans, 464 nanometers. Blue light is also important to plants grown in the interior conditions. This part of the spectrum activates their photosynthetic processes. Their growth without enough blue light in interior would be impaired as well.

This scientific discovery can also help people with insomnia, who should avoid luminaires which provide strong blue part of the spectrum in the rooms they are usually sleeping in. There are even light sources specifically designed to filter out blue light for use in the bedrooms or reading luminaires.

The content of the blue light changes during the course of the day, ideally the lighting system should reflect that to provide maximum comfort for the users and not interfere with their circadian rhythms. The tricky part is that one of the sources of blue light are computer screens, making management of blue light content more difficult. However, free programs are available that dynamically correct blue light content coming from the screen depending on the time of day. With the aid of such programs working even late hours does not disrupt the natural biological clocks. In lighting systems this is more difficult to achieve, but it can be done with a combination of a well-designed system and daylight sensors.



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