Lee Filters
Encyclopedia
Lee Filters is a Hampshire-based UK brand of colour filters
Filter (optics)
Optical filters are devices which selectively transmit light of different wavelengths, usually implemented as plane glass or plastic devices in the optical path which are either dyed in the mass or have interference coatings....

 and colour gels for the lighting and camera industry. Their colour gels for stage lighting are the industry standard in Europe while competing with other brands such as Rosco.
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