isolux diagram

isolux line

A line through all points on a surface where the illumination is the same; called an isofootcandle line if the illumination is expressed in footcandles. A series of such lines for various illumination values is called an isolux diagram.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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They contain all major product details such as sizes, diameters and weights, mounting systems, mounting examples, useful help with installation, part numbers, and Isolux diagrams showing all the luminous power details.