Encyclopedia

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.
References in periodicals archive
A metric for judging acceptability of direct luminaires in computer offices.
History is today
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.
Improved energy efficiency through better lighting design
Ambient lighting may be achieved with direct luminaires (light fixtures), indirect luminaires, or indirect/direct luminaires.
In the right light
Although installation and fixture costs have previously been thought to be higher than direct luminaires, popularity and familiarity are lowering expenses.
The ups and downs of lighting: deciding between direct and indirect lighting
CIE 117 is even more specific with its Unified Glare Rating (UGR) for direct luminaires.
The customer is always right: even with all the chatter surrounding OLEDs, proponents are well-advised to remember this simple maxim: people buy luminaires, not technology
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