What's in a Color? The Unique Human Health Effects of Blue Light.Įnviron Health Perspect 118:A22-A27. What's in a Color? The Unique Human Health Effects of Blue Light Many studies before this used light sources that you could believe were "like" these newer displays, but this paper tests the exact kind of backlight that we all use many hours a day. Popular press coverage of blue light research In Eyes, a Clock Calibrated by Wavelengths of LightĬites work by Cajochen et al in the May issue of The Journal of Applied Physiology.Ĭhristian Cajochen's lab did the first work we know of that uses real LED displays and measures them against older computer monitors. The "References" section is more up to date, so for a current view of the circadian impact of light and some nice visualizations, we recommend taking a look. Our f.luxometer project collects data for dozens of devices and filters (available for re-use). Many are familiar with the "rods and cones" that provide our visual capabilities, but the retinal ganglion cells containing melanopsin are sensitive to a wide range of "blue-green" frequencies around 480nm.Ī wide range of lights appear to be able to stimulate the circadian system in humans, and so while we refer to "blue light" in order to distinguish it from the light our visual system sees, it includes lights that appear green, blue, cyan, and even orange. The science that explains these new systems has accelerated over the last 20 years, with the discovery of a new photopigment in the eye, called Melanopsin, in 1998. We know that night-time exposure to blue light makes people more alert and also affects their circadian timing. This effect can be minimized by using dim red lighting in the nighttimeīedroom environment." Blue Light Affects Sleep (and here's why) "Recognizes that exposure to excessive light at night, including extended use of variousĮlectronic media, can disrupt sleep or exacerbate sleep disorders, especially in children andĪdolescents. In 2012, the American Medical Association's Council on Science and Public Health made this recommendation: In 2014, a new study was published in PNAS (full text) that compares the effects of reading an iPad before bed, versus a regular paper book. Manuel Spitschan gives a wonderful overview of how the circadian system responds to light: Enlighten Your Clock Reading on a tablet compared with a book This comic book by Coline Weinzaepflen and Dr. Lecture on "Electrical Units of Measurement" (), published in Popular Lectures Vol. Published on Beuk in je kanus 88.I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced to the stage of science, whatever the matter may be. Published on Flux Overload Illuminate - The Classics 2022 Published on Beuk in je kanus 89.0 - Supremacy 2022 Warm-up Mix
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