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The unit of measure of the brightness or intensity of light lumens. For example, indoors, most artificial light intensity of 400-600 lumens. In the sunny outdoor brightness in a wide range of floating in the shade 1000 lumens, such as highways and other large areas of concrete, brightness of 6,000 lumens. Below 3500 lumens of brightness, we the human eye feel very comfortable of ray ban store. When direct light or reflected light to reach 4000 lumens brightness, the human eye receives light started to become difficult. When we try hard to see these very bright area, only to see the white flash, this is the glare. In order to reduce the discomfort caused by a large number of light entering the eye with ray ban sale, squinting. Once the brightness reaches 10,000 lumens, your eyes due to the received light is too strong and completely filtered light. Too long exposure to strong light can cause damage, leading to temporary or even permanent blindness.
We have a basic form of the two to see color. One way is an object itself can be issued a certain frequency of light, such as neon is the display color with ray ban rb3025 ; another way objects absorb all frequencies of light, and only reflect a certain frequency of light, or reflected a variety of frequencies light, the light wave mixing and the perception of a color light, for example, painted the objects is the display color. For example, to see the yellow light, the way is a direct object issued a yellow frequency of light; another way is to absorb the blue part of the light spectrum, reflective red and green part of the light, these two light mixed after eye perceived as yellow.
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