The duration of light was equal to that of darkness.

灯光一明一暗，间隔相等。

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To properly regulate the duration of light, you may want to consider getting a timer for your grow lights.

为了更合理地调节光照时间，您可以为人工光源加一个定时插座。

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Research demonstrates that red light problems at intersections can be corrected simply by extending the duration of the yellow light a second or two.

FORBES: OUT OF FOCUS

Additionally, the popular waterfront Darling Harbour precinct will be transformed into a spectacular exhibit of illuminated dancing water fountains, with light and water shows every night from 6 pm for the duration of the festival.

BBC: A kaleidoscope of light, music and ideas in Sydney

Using electricity generated by the wind, "Delmarva Power will be able to light about 50, 000 homes a year, every year" for the duration of the 25-year contract, Lanard said, with first power expected by 2012.

CNN: Wind farm to be built off Delaware shore