A constant voltage power supply can be used to power led lights that have resistors or constant current drivers already within the system.
Computer power supply for led lights.
I am using an old pc power supply to run all my led s wether they are 12v 5v 0r 3v.
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I have to correct something on the video.
If you are powering from a battery or happen to have a constant dc voltage that is adequate for your lights then consider yourself lucky.