When you increase the temperature even more, it will then turn orange, and then to a brighter yellow. If you increase the temperature it will begin to glow red. If you take a piece of iron and begin to heat it, you see that at low temperatures, it doesn’t emit light. These cases are much more frequent than pure colored light. 580nm), rather that you have a mix of different wavelengths which, when all combined, give you yellow. For instance a standard light bulb will give you a yellowish shade, that doesn’t mean there is only a “yellow” wavelength (i.e. If you mix different wavelengths in unequal proportions, you can get colored light. If you mix many different wavelengths in similar quantities, you get white light. Here, I’ve only talked about “pure” colored light, where there is only one wavelength which gives one color. Small water droplets can decompose light waves depending on their wavelength, thus generating a rainbow: the higher wavelengths (red) are separated from the shorter wavelengths (violet/blue), with all the intermediate wavelengths in between. White light is a mix of all these wavelengths together. Blue light corresponds to short wavelength, around 450nm. For instance, red light is light with a wavelength of about 700 to 800nm. What does it mean? As you may know, light is a wave, and its color corresponds to its wavelength. The software I will talk about describe their effect as changing the “color temperature” of the screen. If you are unsure, just try it, you will really feel the difference when you deactivate it after a few minutes. I hope I convinced you to install this software. If you’re using a computer the whole day, you may notice your eyes get tired after some time it really feels much better when you have less white light coming from the screen. Of course, this is a very short (and a little bit incorrect) summary if you want to know more, there are numerous more detailed articles out there on the Internet, beginning with Wikipedia or this page.Īnother reason why you might want to use such a software is simply that the light coming from the screen is dimmed, making it less aggressive to the eye. That’s why a software synchronizing the light from the screen to the daily cycle could help us keep our circadian rhythm “healthy”. So, in a way, when using such a screen late in the evening, we are telling our body that it’s not time to sleep yet, thus perturbing our circadian rhythm, which can lead to sleep disorders. However, the computer and phone screens we use tend to always display white or even blue light. So, one way for our circadian clock to keep synchronized is to analyze the color that we see: if we see orange light, it’s probably the evening, we should prepare to sleep, whereas if the ambient light is blueish, it’s probably not time to sleep. Indeed, if you lived in a “natural” environment without artificial sources of light, you would expect to have more reddish/orange light during the evening, as the sun is setting down, whereas during the day you would see more blue light (every time you look at the sky). This internal clock keeps synchronized with the real day/night patterns outside by several ways, one of them being the color and intensity of the ambient light. It can influence our feeding pattern, making us hungry when it’s meal time, and can have an impact on many of our activities. It’s also the cause of the jet lag we encounter when we switch time zones. In short, it’s the process making us sleepy in the evening, and not in the morning. They allow maintenance of these processes and behaviors relative to the 24-hour day/night cycle in nature. These “clocks” are known as circadian rhythms. Most animals and other organisms have “built in clocks” in their brains that regulate the timing of biological processes and daily behavior. The standard argument is that it supposed to be good for your circadian rhythm. Principle and descriptionįirst a short introduction on why you would want to use such a software. Applications such as redshift or f.lux allow to change the color of the computer screen during the day.
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