Lumen method

Lumen method

(daylighting)
A method of estimating the interior illuminance from window daylighting at three locations within a room, based on empirical studies.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

lumen method, flux method

A procedure in lighting design used to determine the number and types of lamps or luminaires required to provide a desired average level of illumination on a work plane; takes into account both direct and reflected light flux.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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This has been explained by the very nature of the lumen method and c.u.
In defense of the parabolic louver
The suspended ceiling provides a uniform, reflective surface that, even in the most simple "lumen method" or "room-cavity ratio" calculations for lighting, indicates better utilization of light.
Suspended ceilings = energy savings

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