關了燈看電視的時候，總覺得電視在發著藍幽幽的光，照得屋子里都是淡淡的藍色。這是為什么呢？讓下面這篇文章來為你解答這個問題吧！

Color television pictures are produced by three different colors: red, green and blue. These combine to create a whitish light with a color temperature close to that of daylight (5500 to 6500 Kelvin).

Color temperature is a way of describing the relative amounts of the different colors that make up the light from a particular source. It can be thought of roughly as the temperature an object would need to be heated to give off light with that mixture of wavelengths. At low temperatures, low-energy colors such as red and yellow predominate; at higher temperatures the proportions of green or blue increase.

For example, standard tungsten light bulbs have a color temperature of 3200 K and are very yellow. Your eyes adjust to this light, making it appear whiter and more like daylight. At twilight or at night, anything with a higher color temperature than tungsten lights, such as a television, appears distinctly blue.

The same effect is seen if you look out of a room lit by tungsten light. The twilight appears particularly blue, and yet if you were to go outside and look at the same scene, the eye would no longer compare it to the lit room and the colors would appear more neutral.

The converse is also true. Viewed from outside, the windows of houses lit by tungsten light sources look distinctly yellow. Fluorescent sources generally have a spectrum much closer to that of daylight and don't produce the same effect.

Kelvin: 開氏溫標

tungsten: 鎢

spectrum: 光、光譜

（英語點津 Annabel 編輯）