Exit signs in smoke : design parameters for greater visibility

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Journal titleLighting Research and Technology
Pages155160; # of pages: 6
SubjectLighting; Lighting; eclairage
AbstractA review of regulations and specifications for internally illuminated exit signs recommended or enforced by various sanctioning bodies in Canada, Great Britain and elsewhere reveals omissions and inconsistencies which may compromise the safety of building occupants in smoke. Since these problems are partly due to lack of conclusive research, a controlled psychophysical experiment was conducted to assess the readability of three common exit sign design features (i.e. the various combinations of opaque and transilluminated text and backgrounds) under different levels of smoke density and ambient illumination. The sign designs differed greatly in terms of threshold illuminance at the rear of the signs (analogous to the intensity of the sign's light source), but all were similar in terms of the threshold luminance of the sign's front panel. Based on these findings, recommendations are made for improved building codes.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NoteAlso presented at the National Lighting Conference held at Cambridge, UK, March 1988
Peer reviewedYes
NRC number33105
NPARC number20374480
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Record identifier2efcf905-20c3-4cb3-a8a2-571125fd0dcb
Record created2012-07-23
Record modified2016-05-09
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