indirect lighting
[‚in·də′rekt ′līd·iŋ] (engineering)
A system of lighting in which more than 90% of the light from luminaires is distributed upward toward the ceiling, from which it is diffusely reflected.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Indirect lighting
The lighting reflected from the ceiling or other surface, not received directly from a luminaire.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
indirect lighting
Lighting from luminaires which distribute 90% to 100% of the emitted light upward so that illumination is provided primarily by reflected light rather than by direct light.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.