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Publication Number: FHWA-HRT-04-138
Date: December 2005

Enhanced Night Visibility Series, Volume VII: Phase II—Study 5: Evaluation of Discomfort Glare During Nighttime Driving in Clear Weather

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APPENDIX H—VERTICAL ILLUMINANCE MEASUREMENTS

 

Table 12. Vertical illuminance (lx): VES by distance from opposing headlamps (ft).
HLB HID HOH HHB Hybrid UV–A + HLB Three UV–A + HLB Five UV–A + HLB HLB–LP Hybrid UV–A + HID Three UV–A + HID Five UV–A + HID
1,300 0.13 0.12 0.11 0.07 0.14 0.14 0.14 0.12 0.13 0.13 0.13
1,250 0.17 0.13 0.13 0.09 0.18 0.18 0.18 0.12 0.14 0.14 0.14
1,200 0.13 0.11 0.14 0.08 0.14 0.14 0.14 0.13 0.12 0.12 0.12
1,150 0.13 0.12 0.15 0.09 0.14 0.14 0.14 0.13 0.13 0.13 0.13
1,100 0.14 0.13 0.16 0.09 0.15 0.15 0.15 0.13 0.14 0.14 0.14
1,050 0.15 0.15 0.17 0.10 0.16 0.16 0.16 0.15 0.16 0.16 0.16
1,000 0.17 0.16 0.18 0.11 0.19 0.18 0.18 0.16 0.18 0.17 0.17
450 1.07 0.75 1.35 0.83 1.13 1.09 1.09 1.08 0.81 0.77 0.77
400 1.40 0.40 1.89 1.18 1.48 1.42 1.42 1.56 0.48 0.42 0.42
350 1.96 0.19 2.59 1.80 2.08 1.98 1.98 2.05 0.31 0.21 0.21
300 2.77 0.20 3.34 3.01 2.95 2.79 2.79 2.52 0.38 0.22 0.22
250 3.73 0.20 4.41 4.69 4.01 3.77 3.75 2.66 0.48 0.24 0.22
200 4.06 0.24 5.18 7.60 4.47 4.09 4.10 2.99 0.65 0.27 0.28
150 3.62 0.31 3.67 14.19 4.07 3.65 3.65 2.99 0.76 0.34 0.34

 

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