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A comparative field usability study of two lighting measurement protocols

Published Online:pp 323-343

We developed a lighting measurement protocol (PC-SRT) for Android mobile devices as a replacement of the Argentinean currently mandatory pen-and-paper measurement protocol (SRT-P), and compared their usability in a field study (n = 26) by means of the system usability scale (SUS). Descriptive statistics showed that PC-SRT (SUS = 58.7; SD = 14.9; lower marginally acceptable usability) outscored SRT-P (SUS=47.5; SD=14.5; unacceptable usability). The PC-SRT also performed better in both ease of use and learnability factors. An item-by-item analysis compared the behaviour of each standardised item score; Mann-Whitney test results showed statistically significant differences in SUS-Q1 (U = 36; p = 0.011), SUS-Q2 (U = 35; p = 0.01), SUS-Q4 (U = 46.5; p = 0.05), and SUS-Q7 (U = 39; p = 0.019). These results show that although PC-SRT gathers more data in a wider variety of aspects of the visual environment, users tended to perceive it as easier to use, encouraging the adoption of our proposed lighting measurement protocol for mobile devices.


usability, comparative field study, lighting measurement protocol, system usability scale, SUS, human factors