• The non-visual effects of light on human health.

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    The non-visual effects of light on human health.
    Have you ever had the experience of not being able to fall asleep after look at your phone for a long time? The blue light that your smart phone emits is not only bad for your vision, but it's bad for your brain too. Evidence is accumulating that depression, anxiety, and sleep quality may be associated with 480nm blue light overuse.We can divide the effect of light on people into two types: Visual effect(recognition of colors and brightness) and Non-visual...

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  • How Should We Design Office Lighting?

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    How Should We Design Office Lighting?
    Linear lighting will play an increasingly important role in the office environment of the future. In addition to providing sufficient light for the office, it will also enhance people's comfort and work efficiency in the office.As we all know, when there is not enough light, it will lead to visual fatigue, physical fatigue and even headache, which will lead to concentration problems and affect productivity. Likewise, when the light is very harsh, the TV or computer screen will look gray...

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  • What is the PAR and PPFD?

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    What is the PAR and PPFD?
    PAR (Photosynthetically Active Radiation) describes the portion of the visible spectrum that plants “see” and use for photosynthesis (400nm-700nm). PPFD (Photosynthetic Photon Flux Density) measures the amount of light (PAR) a plant receives over time. PPFD represents the light density a plant receives over time and is measured in micromoles [of photons] per square meter per second (1).A way to visualize PPFD is to imagine the sun is “pouring” light onto the plant leaves. As the sun pours light onto...

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