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

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

 
Footcandles:
DistanceTD-12TD-18
4'1.21.7
6'.27.53
8'.08.53
10'.15.27
12'.08.18
14'.03.09
16'.01.03
18' .01
For conversion to lumens, multiply footcandles x 10.