Question 1

What is the hazard of blue light?

Accepted Answer

Blue light, especially short-wave high-energy blue light (400-450 nm), produces toxic reactive oxygen species (ROS), which leads to damage and apoptosis of retinal pigment epithelial (RPE) cells. This oxidative stress not only destroys the RPE, but also indirectly leads to the death of photoreceptor cells (cones and rods). Prolonged exposure to such blue light accelerates the development of degenerative eye diseases, especially macular degeneration. In addition, blue light is associated with eyestrain (visual fatigue, dry eyes, headaches) and sleep disorders (suppression of melatonin formation). Therefore, protective measures such as the use of blue-light filtering glasses or reducing the use of electronic devices at night can effectively reduce the harmful effects of blue light on the eyes.

Question 2

Does all light emit blue light?

Accepted Answer

Light is an electromagnetic wave that encompasses a broad spectrum from infrared and visible light to ultraviolet light. Blue light, like other colours of visible light, is everywhere. But it has different proportions of blue light in different colours of light. Natural light covers the entire visible spectrum, including blue light. Therefore, natural light does contain blue light; traditional incandescent lamps contain less blue light because their spectrum is dominated by red, orange, and yellow light, with a weak blue light component; fluorescent lamps also emit a certain amount of blue light; and LED lamps and most electronic devices (e.g., mobile phones, computers, and televisions) emit a higher amount of blue light from their screens, especially cool white and white LEDs.

Question 3

What is the CCT of blue light?

Accepted Answer

In general, the higher the colour temperature, the more blue light component in the LED spectrum. Blue light is mainly concentrated between 400-500 nm, and high colour temperature LEDs require a stronger blue light component to produce cool white light or daylight white light. This is because LEDs rely on blue light chips to excite the phosphor to produce white light. Low colour temperature LEDs (<3000K) have a reddish-yellow spectrum with a lower blue light content and are mainly used in warm lighting environments. High colour temperature LEDs (5000K-6500K) emit a cooler white light with significantly higher blue light content.

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Blue light in LED – the standard and how to reduce it

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LED Street Light

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LED High Bay Light

High Mast Light

LED Traffic Light

LED Tunnel Light

LED Garden Light

LED Canopy Light

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Lighting Accessories

Smart Systems

Simulation Design

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