LEED interpretation 10236 (http://www.usgbc.org/leed-interpretations?keys=10236&=Search#) seems to indicate that the lighting boundary is a modification of the project boundary (e.g. 5' at parking lots or to centerline along public streets). It also says, "All instances in the credit language of "LEED project boundary" or "site boundary" shall be considered to refer to the "lighting boundary", for the purposes of this credit only."

So, when the LEED credit says, for LZ3... "produce a maximum initial illuminance value no greater than 0.20 horizontal and vertical footcandles at the LEED project boundary (aka "Lighting boundary") and no greater than 0.01 horizontal footcandles 15 feet beyond the site (aka "Lighting boundary")."

... Am I interpreting this correctly that we FIRST establish the lighting boundary with allowances noted in the interpretation, THEN demonstrate 0.2 horiz/vert fc @ the modified lighting boundary, and 0.01 horiz fc @15' beyond that lighting boundary?

Please advise. Thanks!