饱和度和亮度也影响到我们的感觉。

The saturation and lightness of light also affect our perceptions.

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颜色和亮度同样也能改变我们的思维方式。

Color and light can also change the way we think.

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实际上灯泡寿命和亮度的改进全部来自灯泡制造商自己的选择。

Practically all the improvements in terms of life and brightness since then have come from the bulb-makers themselves.

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In the case of the ambulance and police car, it's more a question of brightness.

警车和救护车上之所以用红灯，大多是因为红灯亮度大。

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