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Light and lighting (1908)
Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 87
chlight purposes. Total Angle of Dispersion. Mult Plj ing Power il Beam, Degrees. L70 . 180°. 90°. ].. . 4i.(i7r, 25,000 7, :i :..-> 2.. . 11,380 <>.<;< )0 [,950 3.. . 4,918 2,940 862 4.. . 3,798 1,640 482 5.. . J.T«*ii 1,050 308 10.. MS 202 77 20.. — 65 19 45.. — 13 3-86 6(1.. — 7-2… … 270° reflected. 180 reflected Fig. 2.—Showing approximate contours <•! thethree reflectors embracing respectively 90 ,180. and 270 of light-flux, and producingapproximately the same power of beam withspherical light sources of equal power. THE ILLl.MIN \T!X«; ENGINEER (maboh L918) 7.-. received…Lighting
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