Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 156
surface of the ceiling. THE ILLUMINATING ENGINEER (june 1919) 145 In industrial lighting, factories andmills, the height at which lamps can behung is frequently great enough topermit the satisfactory use of directlighting equipment, such as vitreousenamelled reflectors, but here also itis well to… … Fig. 5.—Polar curves of light distributionshowing candlepower values in the verticalplane for bare metal filament lamps. A .. 60 watt—110 volt vacuum type.B .. 60 watt—110 volt gas-filled type. The necessity for equipping and usingthe new lamps so as to safeguard lightusers against effects of glare…
Lighting
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