The more LEDs you hook up to the wall wart, the better. One 9 volt battery will run 100 plus 5 MM LEDs. It;s not the volts, it's the Amps. 5 Volts and probably 5 MA shouldn't effect the bulbs. If they appear to be the correct brightness, they should be fine. Worse that can happen is burnout. If there is too much amperage, they will pop first... Just monitor if you are not sure of the AMPs, or test with a multi meter....😃
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