> The customer only wants two digits, and I guess I can put
> at least 5 in series, so that would be 7 x 2 x 120 x 0.02 / 5
> = 6.72 A. 8

BTW, set your PSU voltage to match series forward voltage
of the LEDs. For example, a yellow is typically around 2.1V,
so you could put 3 in series on ~ 6.5V supply with no current
limiting resistor, makes life simpler (no heat) and a little cheaper

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