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Time-lapse showing varying light levels

This time lapse video produced by London Southbank University PhD researcher, Zoe De Grussa, for the British Blind and Shutter Association (BBSA) shows that on two consecutive days in September 2016 there is one day of relatively consistent light levels and the following day continually variable light levels due to cloud cover.

Window blinds help to attenuate these varying light levels.

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