Spacing for minimum footcandle (fc) illumination on level ground:
Note: 1fc for commercial projects / .3fc for residential projects
| Footcandles | ||
|---|---|---|
| Distance | DR-10 | DR-20 |
| 2' | 1.1 | 2.3 |
| 4' | .27 | .61 |
| 6' | .10 | .14 |
| 8' | .04 | .06 |
| 10' | .01 | .03 |
| 12' | .01 | |
| For conversion to lumens, multiply footcandles x 10. | ||
