I think the question is… where and how. According to the datasheet ‘schematic’, all the LEDs are in parallel. Or maybe they are in groups of 25 and each group is in series. It doesn’t show resistors at all, but the photo just shows the 1 at 51 Ohm. Which makes little sense unless there’s 4 in series with a voltage drop of 2.8V to get roughly the 16mA claimed elsewhere in the datasheet. It would also be an odd (let’s put it that way) design but then again it’s cheap.
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