F21V 9/06
Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for filtering out ultra-violet radiation
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Edits on 5 Mar, 2022
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F21V 9/06
Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for filtering out ultra-violet radiation
Infobox
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