You searched for: “phengophobia
phengophobia (s) (noun) (usually only in the singular)
1. An excessive fear of daylight or of sunlight: Human manifestations of phengophobia involve secluding themselves in curtained rooms where the brilliance of the sun cannot enter and only allowing illumination by artificial lambency. Usually the individual can go out at night and move around in greater comfort than during solar time.
A man who has phengophobia and avoids direct sunlight.
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We mustn't fear daylight just because it almost always illuminates a miserable world.

—René Magritte
2. In biology, intolerance of luminosity: Some creatures have a natural phengophobia, including certain plants and animals, because they cannot exist in bright fulgence.