Now many lights  for studentshas emerged in the market but with high prices, we must buy it?

        Faced with these issues, we understand that knowledge of the following: the type of lamps are many, from the perspective of daily use, can be divided into incandescent and luminescence light. Incandescent working principle is relatively simple, the filament is heated to very high temperature, into the incandescent state, thus the light energy into electrical energy, then to visible light. The main characteristics of such lamps is when lighting, their own temperature is high, and the luminous "color temperature" is lower. What is " color temperature "? We can cite a simple example: a coal, when burning in different temperatures it will emit different lights, in low temperature, reddish color, with the temperature rising, the color change to blue gradually. The only color temperature will only cause changes in the color of objects, for example,when choosing clothes in shopping malls, experienced customers will always get the real color of the clothes with the natural light from the window, not do their judgement under the lights, incandescent HEC will not affect people's eyesight. Luminescence light has more complicated theory of lighting, such lamp bulb or lamp pipes have a phosphor coating inside. It also has filament, but is not alone to work the heated filament, the light of their own temperature is not high, but often high color temperature, lighting gives the impression of the blue, but still has nothing to do with people's eyesight. From the above we can know, as long as the you keep correct use of eye health and ensure adequate illumination sufficient, short-sightedness can be prevented. If you have no correct eyes habits, even reading in the sun can cause myopia.