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Spacing for minimum footcandle (fc) illumination on level ground:

Note: 1fc for commercial projects / .3fc for residential projects

 
Footcandles:
Distance CA-10 CA-20
2' 1.5 3
4' .31 .88
6' .14 .33
8' .08 .14
10' .03 .08
12' 0.1 0.3
14'   .01
For conversion to lumens, multiply footcandles x 10.