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12W aluminum substrate: full string circuit DC36V
18W aluminum substrate: full string circuit DC54V
20W aluminum substrate: 2 parallel 10 series (2B/10C) DC30V
24W aluminum substrate: full string circuit DC72V
30W aluminum substrate: full string circuit DC90V
36W aluminum substrate: full string circuit DC108V
50W aluminum substrate: 2 parallel 10 series (5B/10C) DC30V