Danny/Bob,

This is what I've listed in my inventory:

GREAT LAKES SERIES:
Old Mackinac Point, Michigan HL 118
Cana Island, Wisconsin HL 119
Grosse Point, Illinois HL 120
Marblehead, Ohio HL 121
Buffalo, New York HL 122
Michigan City, Indiana HL 123
Split Rock, Minnesota HL 124

GREAT LAKES STAMP SERIES (All 5 are HL 400; all 5 flag numbers are A 682):
Spectacle Reef, Michigan HL 182/410
St. Joseph, Michican HL 183/411
Split Rock, Minnesota HL 124/412
Marblehead, Ohio HL 121/413
30 Mile Point, New York HL 184/414

The stamp series pieces are smaller than the limited editions. The edition numbers beginning with the numeral "4" indicate these pieces are GLOW or open editions; the "1" numbers indicate there was also a limited edition of the piece.
If I were to sell the stamp series, I would describe the set as a GLOW's set because the set has HL 400 as its edition number as a set, and each of the 5 pieces within the set has the "4XX" as its edition number.
If I were to sell The Great Lakes Series as a set, I would describe the set as Limited Editions.
I won't go into how many emails have passed between me and Harbour Lights on this subject. . .suffice it to say, I'm hoping one or both of you (and any others who'd like to offer their opinion) will tell me if my interpretation is right or wrong.