This character means the glow of fire and is mostly seen in given names today.
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燏 has essentially no standalone use in modern Chinese; it means the radiance of fire and survives almost only as a character chosen for personal names. It is the fire radical 火 plus the phonetic 矞, the same phonetic in 谲 and 鹬.
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Rare and onomastic; in ordinary speech 火光 is used for firelight.