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Light Sources, Second Edition, 2nd Edition
book

Light Sources, Second Edition, 2nd Edition

by Spiros Kitsinelis, Spyridon Kitsinelis
May 2015
Intermediate to advanced content levelIntermediate to advanced
295 pages
8h 16m
English
CRC Press
Content preview from Light Sources, Second Edition, 2nd Edition
1.6 Measuring Light 21
Figure 1.28. An integrating sphere (Ulbricht sphere) for measuring a lamp’s
luminous ux.
Figure 1.29. Another integrating sphere (Ulbricht sphere).
22 Basic Principles of Light andVision
Each unit surface of the sphere is illuminated proportionally to the ux of
the light source and a small window collects and measures this luminous
ux. A unit like the lumen is dened as the total radiated power in watts
times the efcacy of the light bulb times 683 lm/W.
The surface of a sphere is 4π r
2
where r is the radius of the sphere, ...
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Publisher Resources

ISBN: 9781482243673