Direct luminaire

Direct luminaire

Emits over 90 percent of light downward. Recessed lights, downlights, and trof-fers are direct luminaires.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

direct luminaire

A luminaire which emits 90% to 100% of its total output below a horizontal plane through it.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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A metric for judging acceptability of direct luminaires in computer offices.
The use of ballasts with a BF of 0.77 may provide more comfortable lamp brightness without sacrificing efficiency in direct luminaires where the lamp is visible.
Ambient lighting may be achieved with direct luminaires (light fixtures), indirect luminaires, or indirect/direct luminaires.
Although installation and fixture costs have previously been thought to be higher than direct luminaires, popularity and familiarity are lowering expenses.

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