light box

noun
a boxlike object having a uniformly lighted surface, as of ground glass, against which films or transparencies can be held for examination.

Origin:
1840–50

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World English Dictionary
light box
 
n
a light source contained in a box and covered with a diffuser, used for viewing photographic transparencies, negatives, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Typically, light therapy involves sitting in the glow of a light box which emits a spectrum of light mimicking daylight.
Bacteria-free animals spent significantly more time in the light box than their bacterially colonized littermates.
Also, affixed to one wall is an unusual giant light box, which can display any image the homeowner chooses.
To spend time with a light box and crayons and show him how to prepare books for the printer.
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