Courtroom Lighting Criteria Evaluation
Task 1 Report
The US Courts have experienced some failures in lighting satisfaction within some of the recently
constructed courthouses. A study by the General ev e A mis ai s f eo A pe
S ri s d n t tn Of f p ld
Sciences through the National Institute of Building Sciences was undertaken by Arup Lighting to
evaluate the lighting installations with respect to terq i me to teU C ut D s nG i .
h e u e ns fh S o r ei u e
Based on these surveys, it was determined that several aspects of the Design Guide should be
revised to more clearly define methods to achieve successful courtroom lighting. These include:
More specific requirements for illuminance targets
Current illuminace targets are on work sur c o li l evertical illuminance
Provide more detailed illuminance targets related to specific task locations
Discussion of surface brightnesses
Dark wood surfaces cause contrast problems, which need to be thoroughly
studied during the design process.
Modern computer methods provide ways to predict surface brightnesse and
should be used.
Contrast and luminance ratios
Luminance ratios can vary greatly depending on lighting scheme and surface
Luminance is the brightness that is seen by the eye, and hence is as important as
illuminance during the design process.
Physical mock-ups in the past have not included important design considerations
due to their cost.
Allow scope for the design team or independent third party, or both, to perform
advanced computer modeling to verify the actual end result.
We recommend that the Design Guide be revised to incorporate these ideas to ensure successful
lighting in future new courthouses
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Issue March 1, 2006
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