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

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

 
Pies-candela:
DistanciaDP-10
2 pies2,6
4 pies0,57
6 pies0,13
8 pies0,05
10 pies0,03
12 pies0,02
14 pies