Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 264
thanother known energy distribution. The source of light employed up to thepresent had been the gasfiUed lamp, andno single pigment had been found whichwould bring about the desired conversion.By utilising more than one pigment,however, in definite proportions by area,a shade could be produced… … the reflected light. An under-rerlectorwas used on all the units, which servedthe double purpose of giving increasedillumination on the shade and cutting offall uncorrected light. W hen the last report of progress wasread before this Society a vear ago. theinitial difficulties had been overcome,…
Lighting
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