"shortage" and "scarcity" make it sound rather as if daylight hours are goods or commodities, like potatoes, or coal, or toilet paper, or whatever. "inadequacy" can give the impression that the daylight hours themselves are individually not satisfactory, rather than that there are not enough of them.
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Hi ,
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the link here: https://english.stackexchange.com/questions/546247/shortage-or-shortening