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The SRV1 pot is for adjusting voltage when in a constant voltage mode. When using it as a constant current driver for LEDs, the voltage will float to what the array needs, and the SVR1 pot is pretty much useless. You may be able to get away with 14 LEDs if the forward voltage of the LEDs is low, and you can sneak it in there. Remember that the voltage range for constant current mode is up to 48v (+/- one or two volts).