Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 74
ution of thelight given from the unscreened lamp.Approximately 50 per cent, of the totallight emitted is sent in an upwarddirection and, what is probably evenmore important, a large proportion of thelight is thrown outwards. Such light cannever under any circumstances illuminatethe display for… … Fig. 1.—Showing proportion of light from anunscreened gas-filled lamp usefully em-ployed and wasted in show-windowlighting. The fundamental principle of show-window Lighting which is adhered to inmany of the leading stores, but is notcomplied with in many others, is that thelight should be directed…
Lighting
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