Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 43
advantages of the unit are statedto be as follows :— L The maximum light is sent out atan angle 15° below the horizontal. 2. The intrinsic brilliancy of the fila-ment is reduced whilst the absorption ispracticably negligible. 3. The lamp is weather-protected. 4. The enclosing glass unit allows… … Fig. 2.—Typical Fitting. For street lighting such a unit shouldbe very useful. It achieves the resultof securing the desired distribution oflight, so as to illuminate the pavementevenly by altering the direction ofthe rays and without absorbing a con-siderable proportion of the light. At thesame…
Lighting
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