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Predicting lamp spectrum effects at mesopic levels. Part 2: Preferred appearance and visual acuity

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Figure

Figure 1Vertical and horizontal sections through theside-by-side booths used in the testsNotes: The per-pendicular distance from the back wall of the booths tothe observer’s eyes when judging preferred appearanceis 1575 mm
Figure 2Spectral power distributions of the lamps testedNotes: These are as measured from the observer’s viewpoint and hence include modifications by the test apparatus, and are normalised for a peak response of 1.0
Table 3Results of the preferred appearance tests; percentage frequency by which the first lamp in each pair wasreported to give the preferred appearance of the target object
Table 4Overall preference scores and rank order of lamps
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