Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 28
ct lighting, toobtain reasonably uniform illuminationwith units spaced at a distance apartgreater than twice their height from theworking plane. A very usual heightof suspension above floor level for directunits of medium power is 8|—10 feet. In narrow buildings (up to 30 feet wide)units are… … Elevation. Height ofSuspension. Working PlaneFloor. TYPICAL SPACING ARRANGEMENTS. 18 THI-: [LLUMINATING ENGINEER (jan. L922 tliree or more—according to the length)being half the distance from the wallthat they are from the centre lamp(or intermediate lamps). In approxi-mately square interiors…
Lighting
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