Abstract
Photometric data of some luminescent paints and lacquers are given which enable these materials to be treated as items of illuminating engineering equipment.
Factors which affect the brightness of a luminescent material are shown to include the type of material, its weight per unit area, the nature of the backing surface, the type and intensity of the exciting radiation and the temperature of the material. The effect of these factors is described and the general effect of deterioration in luminescence with life investigated.
The phenomenon of phosphorescence has also been investigated for certain materials.
A method is given by which luminescent effects may be calculated from a knowledge of visual data of a similar installation.
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