diffusing screen

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Noun1.diffusing screen - a transparent filter that reduces the light (or some wavelengths of the light) passing through it
filter - device that removes something from whatever passes through it
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Enveloped by a delicate, light diffusing screen of iroko, a new gallery for the KwaZulu-Natal Society of Arts in Durban combines elements of solidity and transparency in a thoughtful yet expressive refinement of function.
The light therapy system recommended by the Society for Light Treatment and Biological Rhythms consists of a set of fluorescent bulbs installed in a box with a plastic diffusing screen.