Over the years, many people have reached out to me with questions about LED lighting. As someone who has been deeply involved in the lighting industry since my university days, I often get asked directly about how LEDs affect children’s vision and overall health. When it comes to choosing a desk lamp for long-term reading or studying, it's not just about energy efficiency—LEDs are definitely efficient, but when it comes to comprehensive eye health and lighting quality, not all LEDs are created equal. If you want a truly high-quality lamp, you might need to invest more time and money to find the right one.
Even though LED lamps dominate the market today, their quality varies widely. One common issue is that many use low-power LEDs, which may not provide enough illumination for prolonged reading. This can be harmful to eye health, especially if used as a primary study light. While they might work well as a nightlight or bedside lamp, insufficient brightness for reading can lead to eye strain and make it harder to focus over time.
Another concern is the color of the white light produced by most LEDs. These lights are typically made by coating a blue LED chip with phosphor, which emits yellow-green light. The combination of blue and yellow-green light results in a white tone—but this lacks red wavelengths, leading to a higher color temperature than ideal for indoor use. Some LEDs even exceed the recommended range, which can be uncomfortable for the eyes. Plus, the blue light emitted by LEDs at close distances can potentially harm vision, so it's important to choose wisely.
Additionally, because LEDs are small and bright, glare control is crucial. If a desk lamp doesn't have proper anti-glare features like a diffuser or lens, it can cause direct glare, making it harder to read and reducing visual comfort. This is especially important for students who spend hours under a lamp.
When selecting a learning lamp, whether or not it uses an LED light source, I always look for certain key factors. Here are the main things I consider:
- Compliance with national standards: A good learning lamp should have passed the mandatory 3C certification and be within its validity period.
- Warm white light: The color temperature should be between 3200K and 3400K, as this type of light is most comfortable for the human eye and supports healthy vision.
- Glare-free design: The lamp should not emit direct or reflected light into the eyes. A simple test is to position your eyes 400mm above the desk and 600mm away from the lamp’s center—there should be no visible glare from the shade.
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