12v led strip to 5V led strip

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original led strip circuit:
where input 12v
and r = 150 ohms:


and make work on 5.1v rail removed resistors , attach them 2 2 :


at end used n mosfet negative control arduino question is:
is there problem because used no resistors on leds ?
they powered 5.1v wall adapter, not @ full brightness , not getting hot.

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