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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A diffusing screen ensures enhanced light distribution and eliminates confusing light striations caused by the contours of the tubes.
Light therapy uses boxes or visors equipped with a diffusing screen and special bulbs that are up to 30 times brighter than standard home lighting fixtures.
The recommended light therapy system consists of a set of fluorescent bulbs installed in a box with a plastic diffusing screen, and it is set up on a table or desktop at which one can sit comfortably for the treatment session.