DIGITAL LIFE

Dark mode or light mode? Dark mode gained popularity for saving battery and being easier on the eyes, but the reality is more complex

Dark mode has become a favorite feature among smartphone users. Found in virtually all operating systems and apps, it promises greater visual comfort, longer battery life, and even better sleep. But do these advantages really hold true in every situation? Recent studies show that the answer depends on several factors and that many myths still surround this setting.

You simply need to open your phone's settings to find the option to enable dark mode. The interface replaces traditional light backgrounds with shades of black or gray, offering a look that many users consider more elegant and less harsh on the eyes.

However, experts warn that the benefits aren't universal. The experience varies depending on the screen type, brightness level, ambient lighting, and even an individual's specific vision characteristics.

At night or in dimly lit environments, for instance, dark mode often provides a more comfortable experience. Since the screen emits less perceived light, the contrast between the smartphone and the surroundings decreases, reducing glare when checking messages or browsing for a few minutes.

However, this doesn't mean the feature eliminates eye strain caused by prolonged screen use. According to the American Academy of Ophthalmology, visual discomfort is more closely linked to excessive time spent in front of the device, improper brightness, screen reflections, viewing distance, and a reduced blinking rate.

Another important point is that there is no consistent scientific evidence showing that the light emitted by smartphones causes direct retinal damage during normal use. The sensation of tired eyes after hours of using the device is usually linked to the continuous effort of focusing and to dry eyes, rather than whether the interface is light or dark.

Furthermore, for those who spend long periods reading text, light mode may still be the better option. Several studies indicate that reading tends to be faster and more accurate when dark letters appear against a light background.

This occurs because lighter surfaces cause the pupil to constrict, increasing the sharpness of small letters. In dark mode, however, the pupil remains more dilated, which can make white characters appear slightly blurred or surrounded by a faint glow, especially with small font sizes.

Among all the advantages attributed to dark mode, energy savings is the one with the strongest technical backing. However, this does not occur in the same way across all devices.

The greatest benefits are seen in smartphones equipped with OLED or AMOLED screens. In these panels, each pixel generates its own light. When an area of ​​the screen displays absolute black, those pixels simply remain off, thereby reducing energy consumption.

Devices with LCD screens operate differently. They feature a backlight that remains on regardless of the color being displayed. Even when the interface shows a black background, this light stays active, making the difference in power consumption quite limited.

Researchers at Purdue University analyzed this behavior and observed that, under normal usage conditions with auto-brightness enabled, the energy savings achieved by dark mode on OLED devices typically range from approximately 3% to 9%.

When brightness is set to very high levels, this reduction can approach 40%. However, this scenario represents a specific situation far removed from most people's daily usage habits.

App design also plays a role. Interfaces using absolute black save more energy than those relying solely on shades of gray. Photos, videos, animations, and colorful elements also diminish this energy-saving advantage.

Another common misconception is the belief that dark mode alone improves sleep quality. While it reduces the amount of light emitted by the screen at night, it does not completely eliminate the effects of prolonged phone use before bedtime. Exposure time, high brightness levels, and even the content being consumed continue to influence the circadian rhythm and the ease of falling asleep.

Dark Mode consumes more battery...Many users employ Dark Mode in browsers or apps to reduce eye strain or, in some cases, to save device power. However, this attempt to conserve energy can backfire—causing users to consume more power than they save—according to research by the BBC.

This new study was conducted by BBC Research & Development, which explains that when opting for Dark Mode, some users may end up increasing screen brightness beyond the levels typically used for Light Mode pages or apps.

The research team asked participants to adjust the screen brightness to their preferred level of comfort, aiming to better understand their usage habits.

The study found that 80% of participants significantly increased screen brightness after enabling Dark Mode. This increase caused the laptop's battery to drain much faster than when using lower brightness settings on a page in Light Mode.

While the result might seem obvious, it highlights a common pitfall: users who activate Dark Mode to save energy often end up increasing brightness to see the content more clearly, thereby negating the intended savings.

For this reason, experts recommend combining dark mode with reduced brightness, warmer light filters, easy-to-read fonts, and frequent breaks during use. During the day, light mode may still offer better readability. At night, dark mode tends to provide a more pleasant experience.

Ultimately, there is no single ideal setting for everyone. The best choice is one that adapts to the environment, ensures good readability, avoids excessive glare, and provides comfort during daily smartphone use.

 

mundophone