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In the FWIW department, its been my experience that in the US, 'luminous' refers to photoluminescence, wherein the material stores the energy it receives from visible light waves and emits a portion of it over time, even after the light source is removed. Marketers generally use the term 'self-luminescent' or specifically say the item contains tritium or a 'radioactive' light source to indicate the source doesn't require 'charging' before it glows.
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