Illuminated Sign Conspicuity – What Factors Make a Sign Noticeable and Legible?
Sign Research Foundation
Researchers at the Lighting Research Center (LRC) within Rensselaer Polytechnic Institute examined the visual effectiveness (conspicuity and legibility) of signage. The study began with a thorough review of 80 published research, technical reports, codes, and standards. Once knowledge gaps were identified, they explored several experimental pilot studies in those areas. This report summarizes these pilot studies, existing literature, technical reports and codes and standards related to the visual effectiveness of signage. An additional section of the report describes techniques for using an illuminance meter to estimate the luminance of a large-format, self-illuminated sign. Finally, several preliminary guidelines based on the project findings are included for maximizing the conspicuity and legibility of illuminated signs.