you would have to come up with a compatible array of LEDs. If you wire them all in series, you can't deal with the forward voltage requirement.
If you wire them all in parallel, you end up putting a resistor on each of them, or a very large resistor in front of them.
If you create an array, mixing parallel and series, you can keep the forward voltage reqs down into manageable range, while reducing the # and wattage of resistors necessary to protect them from over current.
If you google for LED parallel/series calculator, there is one I have used that will take the info about your LEDs, your power source, how many of them you have and create a workable array for you.
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