Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 168
ANGLE CP 0 220 10 224 20* 230 30° 2I6 40 200 50° I88 60° I68 70° II4 80° 63 Fig. 27.—Industrial fitting for gas-filled lamp, indirect type (employing lamp with bowlof bulb silvered) and polar curve showing light distribution in vertical plane as givenby a 200 watt-100 volt gas-filled lamp. … Fig. 28.—Types of modern enclosing light units for gas-filled lamps. Semi-indirect system. £_tFLECToR_
Lighting
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