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Lamps, lighting supplies, generally refer to appliances that can be illuminated. Human beings used torches for lighting in ancient times, and later there were candles and lamps. In ancient times, "candle" was a kind of torch made of flammable materials, and the torches that had been lit for holding were called candles; the piles of fine grass and branches placed on the ground for lighting were called liao , Liao placed outside the door is called the big candle, and the one inside the door is called Ting Liao. People usually use night lights for safety, and it is especially important for the protection of children at night. People often use night lights to provide a sense of security in light, or to relieve phobias (fear of the dark), especially in young children. Nightlights also benefit the public by revealing the general layout of a room without having to turn headlights back on, avoid tripping over stairs, obstacles or pets, or mark emergency exits. Exit signs often use tritium in the form of traser. Homeowners can put night lights in their bathrooms to avoid turning on the main light fixture and adapting their eyes to the light.
Some frequent travelers carry nightlights to install temporarily in their guest rooms and bathrooms to avoid tripping or falling in unfamiliar nighttime environments. Gerontologists recommend using night lights to prevent falls, which can be a threat to older adults. The low cost of night lights allows for a proliferation of different decorative designs, some with superhero and fantasy designs, while others with the basic simplicity of a small glowing disc. Early electric night lights used small or small neon lights to provide a light source that was much safer than small candles that used an open flame. The neon version uses very little energy and has a long lifespan, but has a tendency to flicker (reminiscent of candles) that some users like and others find annoying. In the 1960s, small night lights appeared, featuring low-power electroluminescent panels that emitted soft green or blue light; similar lights still exist today.
Some night lights include a photocell that can be turned off when the ambient light is sufficiently bright. Other designs also have built-in passive infrared sensors that detect motion and can only be turned on when a person is passing in the dark. With the availability of low-cost LEDs, many different variants have become available, with different colors, sometimes automatically or in a user-controlled manner. A study from the University of Pennsylvania shows that children who sleep under lights or are associated with nighttime sleep have a higher incidence of myopia. However, later research at The Ohio State University contradicted earlier conclusions. The two studies were published in the journal Nature.
Another study showed that exposure to light can protect the eyes of diabetics from retinopathy, which can lead to blindness. However, preliminary research has not been conclusive.
Some people believe that the optimal sleep light conditions are complete darkness. If a night light is used in the sleeping area, it is recommended to choose a yellowish light to reduce the disruptive effect on the sleep cycle. Also, in places other than sleeping areas (such as hallways, bathrooms, or kitchens), night lights may be useful to allow night walking without turning on full light while maintaining a dark sleeping environment.