Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F21
LIGHTING
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F21V
FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
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9/00
Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
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F21V9/08
for producing coloured light, e.g. monochromatic; for reducing intensity of light
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F21V9/12
with liquid-filled chambers
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