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International Journal of Interdisciplinary Research

Table 5 General retroreflective property values measured at 0° (frontal light) and 90° (lateral light)

From: An evaluation of the suitability of fluorescent fabrics and retroreflective materials for road traffic warning clothing in compliance with international standards

  Observation angle Incidence angle Retroreflective property (cd/lx m2)
R1 R2 R3 R4
ε = 0° 12′ 473.3 411.9 1009.5 550.7
20° 463.6 315.4 810.3 559.4
30° 418.0 271.4 557.8 528.1
40° 287.8 145.5 302.0 475.5
20′ 334.6 463.7 576.0 346.7
20° 329.0 245.9 469.6 344.8
30° 311.8 161.5 337.6 325.3
40° 238.0 90.8 196.5 298.8
46.0 76.7 70.9 41.6
20° 46.5 51.6 61.3 48.4
30° 38.4 53.3 51.4 57.4
40° 24.8 19.6 33.0 48.6
1°30′ 22.2 25.1 10.33 16.0
20° 21.8 17.6 10.6 16.8
30° 22.5 17.0 12.9 17.3
40° 17.3 15.7 12.2 15.1
ε = 90° 12′ 471.0 383.5 746.1 446.4
20° 438.3 312.5 525.5 532.6
30° 332.3 273.9 369.4 522.3
40° 191.1 140.0 238.4 466.6
20′ 331.8 404.35 366.7 287.6
20° 321.6 228.3 221.0 324.6
30° 266.5 155.7 153.6 318.5
40° 166.7 86.5 118.4 292.0
4536 91.1 24.2 40.1
20° 44.6 60.0 29.8 39.2
30° 28.9 52.4 32.8 57.5
40° 36.6 19.3 15.4 56.3
1°30′ 22.4 26.8 18.2 16.6
20° 20.7 19.4 9.2 16.3
30° 24.8 20.5 8.7 18.8
40° 9.9 13.5 9.6 16.7