Definition: Viewer for transparencies and films consisting of translucent diffusing top (usually plastics, rarely glass) lit from below by colour-corrected fluorescent tubes to give daylight equivalent light suitable for colour-matching purposes and judging density. * Usually set up as a box but may be set into a desk or work-top and can also be used for inspecting prints.
Lighting standards for boxes
The best-known standard for light-boxes is BS950 part 1: it requires that the correlated colour temperature of the light be 6500 K; that illumination should be at least 750 lux to a maximum of 3200 lux and that the surroundings be neutral in colour.

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