ข้อมูลChanging the characteristics or distribution of the light emitted by adjustment of parts (reflectors with provision for adjusting the curvature F21V0007160000; light filters with provision for variation of colour or intensity F21V0009100000; screens using adjustable parallel laminae or strips, e.g. of Venetian-blind type, F21V0011040000; screens using iris-type diaphragms F21V0011100000; screens using movable sheets without apertures, e.g. flaps or slides, F21V0011180000; adjustable mountings for lighting devices F21V0021140000)

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