One interesting feature is the bulb's auto-shutoff function. It will only shine when ambient light falls below about 200 lux.

这种灯还有一种有趣的自动关闭功能，它只能在周围光亮低于200流明的时候被点亮。

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Half were housed in a standard light-dark cycle of 16 hours of light (at 150 lux) followed by eight hours of total darkness.

其中一半田鼠被封闭起来并做周期性的光照实验，每个周期先用150 勒克斯的光照持续照射16个小时，然后完全黑暗持续16个小时。

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Light therapy — using a 10,000-lux light for 30 minutes a day — can help patients, as can sitting by Windows.

光疗法-每天接受10,000勒克斯光照-能够帮助病人，如可以坐在窗前。

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That might be about to change, though, as South Korea's state-owned Korea Electronics Technology Institute has announced a new image sensor chip that promises to take "vibrant photos" in extreme low-light conditions -- all the way down to 1 lux, which is the equivalent light output of a candle shining one meter away.

ENGADGET: South Korean image-sensing chip enables 1-lux photography

With a built-in Fujinon wide angle 23x zoom lens, superior low-light performance, and excellent sensitivity (F11 at 2000 lux), the GY-HM650 has ideal optics for challenging shooting environments.

ENGADGET: JVC demos GY-HM600, launches HM650 Mobile News Camera with WiFi and FTP at NAB