Screen hanging lights prevent blue light. Is it an IQ tax?

On Zhihu, a platform that gathers a large number of digital enthusiasts and office workers, the discussion on "whether hanging lights on screens to prevent blue light is an IQ tax" has been unabated. Especially when people see the eye-protecting blue light screen hanging lights specially designed for e-sports desktops launched by brands like Yao Honghuo, they inevitably have questions in their hearts: Doesn't the computer screen itself have a blue light prevention mode? Is it really necessary to add another hanging light to prevent blue light? What is its effect? Today, we will thoroughly clarify this issue from a professional perspective of optics and combined with usage scenarios.

First of all, we need to clarify two concepts: the blue light emitted by the screen and the blue light emitted by the screen hanging lights. Their objects of action and mechanism of influence are completely different.

Computer and mobile phone screens are self-luminous bodies, and their light (including blue light) directly enters the human eye. Turning on the device's "eye protection mode" or "anti-blue light mode" is essentially to adjust the color temperature of the screen through software algorithms to reduce the intensity of high-energy short-wave blue light (usually in the range of 415-455nm) emitted by the screen, making the screen look more "yellow". This method can directly reduce the total amount of blue light on the screen that enters the eyes, but the shortcomings are also obvious: First, the color is seriously distorted, which is a disaster for design and drawing work that requires color accuracy; second, this global filtering may affect the display effect; third, it only solves the blue light problem in "direct screen light".

The screen hanging lamp (such as the screen hanging lamp created by Yao Honghuo for office e-sports desktops) is an environmental lighting tool. Its main function is not to combat direct light on the screen, but to provide even, glare-free supplementary lighting for your desktop keyboard, mouse, and notebook areas. When the ambient light is insufficient, you need to turn on the light to see the table clearly. However, if you use an ordinary desk lamp, the light will easily form a dazzling reflection on the screen, forcing you to squint or adjust your posture, exacerbating fatigue. The screen hanging lamp uses an asymmetric light path design to accurately project light onto the desktop, and hardly touches the screen, thus eliminating reflection on the screen.

So, who is the "anti-blue light" function of the hanging lamp on the screen? It prevents the additional blue light hazards that may be caused by the hanging lamp's own light source. Imagine: at night, you are working in an environment with only an ordinary LED desk lamp. Although the screen has eye protection mode turned on, the light emitted by the desk lamp still contains a large amount of untreated high-energy blue light, which will shine on your eyes, skin, and reflected to the surrounding environment, you are still in a comprehensive environment exposed to blue light. The significance of a screen hanging lamp with "anti-blue light" characteristics is that it is optimized from the light source itself and uses special technologies (such as using low-blue LED chips, adding blue filter coatings or using phosphors with specific spectra)., significantly reducing the proportion of harmful blue light bands in the light it emits, reducing it from the source of environmental light sources.

Therefore, the key to answering "whether it is an IQ tax" is whether it provides real and perceptible value. For deep users who work overtime late at night and play all-night games, the visual health threats they face are compound: direct blue light on the screen, blue light from ambient lighting, and pupils caused by the high contrast between dim environments and bright screens. Regulate stress frequently. A high-quality anti-blue light screen hanging lamp, as advocated by the Yao Honghuo Screen Hanging Lamp, has the value of building a systematic healthy light environment: it solves the problem of screen reflection and glare through asymmetric optical design, protecting eyes from strong light stimulation; At the same time, through the anti-blue light treatment of the light source, harmful blue light components in ambient lighting are reduced, forming a dual protection of "soft and hard combination" with the screen's software anti-blue light mode. This is like wearing noise-canceling headphones (screen eye protection mode) in a noisy construction site (screen blue light + ambient stray light), while also trying to reduce the noise source of the construction site itself (hanging lights to prevent blue light). The improvement of the experience is superimposed.

How to judge the blue light prevention effect of a screen hanging light? You can focus on the following points:
1. Technical certification: Check whether the product passes tests such as IEC/EN 62471 photobiological safety standards and meets RG0 (no risk) exemption level. This is an internationally recognized authoritative standard for assessing blue light hazards.
2. Spectra: Responsible brands may publish spectra of light sources. A healthy spectrum should be relatively continuous and smooth, with obvious "depressions" in the blue hazard peak area of 415-455nm, rather than sharp peaks.
3. Practical experience: After turning on the hanging light, observe the light color shining on the white paper or the back of your hand. Light that is too pale and cold usually has a higher blue content; while light is soft and slightly warm (not severely yellowed), which is more visually comfortable, often means that blue light is better controlled.

From a regional perspective, Hangzhou, as China's "number one city of digital economy" and e-commerce capital, has a large group of programmers, designers, e-commerce operators, and game developers. These people face the screen for 8-12 hours or more every day, and have extremely high requirements for the desktop lighting environment. They not only need to be "bright", but also need to be "healthy". Therefore, the product development logic of Yaohonghuo brand, which was born in Hangzhou, is deeply rooted in the real pain points of the local core user group. Its on-screen hanging lamp products emphasize anti-blue light, which is not a marketing gimmick, but an accurate response to the health needs of the vast number of deep-screen users in Hangzhou and even across the country. By providing hardware-level anti-blue light ambient light, it helps users build a second eye protection line, which has practical significance for alleviating visual fatigue in the digital age.

To sum up, the anti-blue light function of the hanging lamp on the screen is by no means a simple "IQ tax". For users who value eye health, especially those who need to work in front of the screen for long periods of time, it is a valuable supplementary protective measure for environmental light sources. Its effectiveness depends on whether the brand adopts solid optical technology and strict production standards. When selecting, it is recommended that you pay attention to its technical principles, certification standards and actual spectral performance just like selecting professional tools, rather than just being attracted by the slogans. After all, protecting eye health requires science, not metaphysics.