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BenQ Knowledge Center

Why Do You Need an LED Desk Lamp?

BenQ
2019/09/03
A LED desk lamp with warm white color temperature on a desk by a laptop for reading

Besides affecting eyes, light also affects our brains. This is because our retinas not only convert received light into an image, they also transmit the bright and dim variations of light to the pineal gland in the brain. The pineal gland is affected by bright and dim light input, and this consequently affects the secretion of melatonin. Melatonin is key to controlling whether people stay awake or want to sleep. During daytime, the secretion of melatonin is inhibited by bright light, which makes people mentally focused. When it is night and time to go to bed, light turns yellow and dim and the secretion of melatonin increases, which reminds the body it is time to go to bed.

The Importance of Color Temperature

Hence, a good desk lamp can change its color temperature according to your daily work-rest schedule. It uses cold white light during daytime which enables you to focus your mind, and warm yellow light when it is time to go to bed, which is suitable for bedside reading, thus avoiding delays in falling asleep. In addition, many studies indicate that learning efficiency is higher under cold white light and results in fewer mistakes in answering questions. There are Korean studies indicating that it is easier to stimulate innovation under warm white light, making it suitable for use in art rooms or music rooms.

The greatest advantage of an LED desk lamp is its dimmable color temperature, which enables any combination from warm yellow to cool white. Other advantages include power savings and longevity. The operating lifetime of an LED desk lamp is 40,000 hours, assuming it operates 8 hours per day, which is equivalent to being used for 14 years. The LED light source has no ultraviolet rays (UV) or infrared rays (IR), hence an LED desk lamp neither hurts the skin nor generates heat.

Are LED Lamps Safe for Eyes?

As for LED desk lamps, we should discuss whether they are harmful to human eyes. It is true that light enables the eyes to see books and objects clearly, but bad light may hurt the eyes. What is bad light? Blue light and flickering are two key issues to be concerned about. It is easy for them to cause retinopathy when the retina receives strong blue light waves for a long time, a phenomenon referred to as the “blue light hazard” we usually hear about. Flickering is another source that may hurt the eyes. When alternates between bright and dim too quickly over time, it means that the light is flickering, something we generally call stroboscopic. Some doctors claim that even if the flickering is very high frequency to the point you can’t notice it, it may still generate rapid contraction of eye muscles, which may make your eyes or overall body feel uncomfortable.

Therefore, when purchasing an LED desk lamp, besides enjoying its advantages, it is also necessary to check whether it meets the blue light safety standards of the EU and whether it passes IEEE PAR 1789 for stroboscopic testing. The BenQ desk lamp series achieves a flicker ratio of less than 10% through a non-flicker circuit design, almost the lowest value in the industry.

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