Minimum coefficient of retroreflection candelas/foot candle/square foot candelas/lux/square metre
| reflective material | observation angle | entrance angle | white | yellow | rec |
|---|---|---|---|---|---|
| Engineer Grade | 0.- 2 | - 4 | 70 | 50 | 14.5 |
| 02 | + 30 | 30 | 22 | 6.0 | |
| 0.5 | - 4 | 30 | 25 | 7.5 | |
| 0.5 | + 30 | 15 | 13 | 3.0 | |
| Honey Comb Or High Intensity Grade | 0.2 | - 4 | 250 | 170 | 45 |
| 0.2 | + 30 | 150 | 100 | 25 | |
| 0.5 | - 4 | 180 | 122 | 25 | |
| 0.5 | - 30 | 100 | 67 | 14 | |
| Diamond Grade | 0.2 | - 4 | 900 | 590 | 210 |
| 0.- 2 | + 30 | 700 | 350 | 180 | |
| 0.5 | - 4 | 600 | 365 | 160 | |
| 0.5 | + 30 | 300 | 200 | 95 |