Many people have reached out to us regarding LED lighting, especially when it comes to choosing a desk lamp for children. Having been involved in the lighting industry since my university days, I often get questions about how LEDs affect vision and overall health. When I buy a desk lamp for casual use, like for a bedroom or a nightlight, LEDs are definitely energy-efficient and practical. However, if you're looking for a long-term reading and study lamp, the situation is different. From a health perspective, not all LEDs are created equal. To find a truly ideal option, you might need to invest both time and money.
Even though LED lamps dominate the market today, their quality varies widely. One common issue is that many of them use low-power LEDs, which may not provide enough brightness for proper reading. This can be harmful to eye health, depending on how they're used. For instance, using such a lamp as a bedside light might not be a big deal, but if it's meant for extended study sessions, insufficient illumination could lead to eye strain and harm your vision over time.
Another concern is the color temperature of most LED lights. Most use blue chips coated with phosphor, which emits yellow-green light. The combination of blue and yellow light creates white light, but this lacks red wavelengths, resulting in a high color temperature. Some LEDs exceed the recommended range for indoor lighting, which can be uncomfortable for the eyes. Plus, the blue light emitted by LEDs at close distances can also pose a risk to eye health, so it's important to choose wisely.
Additionally, due to the small size and high brightness of LEDs, anti-glare design is crucial. If the lamp doesn’t have proper shielding—like a diffuser or a shade—it can cause direct glare, which not only makes it hard to see but also reduces visual clarity, making it unsuitable for reading.
When I look for a good desk lamp, whether it’s LED or not, I focus on certain key factors. Here are the main criteria I follow:
- National Certification: A learning lamp should have valid 3C certification, ensuring it meets safety and quality standards.
- Warm White Light: Opt for a color temperature between 3200K and 3400K, which is more comfortable for the human eye and supports healthy vision.
- No Glare: The light should not shine directly into the eyes or reflect off the surface. A simple test is to sit 400mm above the desk and 600mm away from the lamp. If you can’t see any direct or reflected light, it’s a good sign.
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