Does output voltage setting on a DC-DC constant current regulator matter when driving LEDs?

I have several 5 watt IR leds, and plan to make an IR illuminator for night shooting. I also have some of these: https://www.ebay.co.uk/itm/LM2596-Constant-Current... constant current/voltage modules. For power, I was thinking of using 2 18650 cells in series, as I have the batteries and holders lying around. The voltage, then, is around 8 volts, give or take a little. The forward voltage of the LED is 1.4 - 1.7, but does that mean setting the voltage output of the module to that? At that setting, the current potentiometer does very little, and around 600ma seems to be the best I can get. The module is claimed to have a maximum of 3000ma. Is it simply unable to produce more current as I'm at the bottom end of the (7v - 35v) range? I'm pretty sure I've seen a Youtube video of these LEDs being driven by these modules. The only difference being that the ones I have have a third potentiometer, which I believe is to set the threshold at which it switches to trickle charging, when used to charge lithium batteries. It's possible that the module comes out of the factory without that pot ever being set. There is an LED indicator, but since there's no datasheet anywhere that I can find, I don't know if the LED being off indicates that this trickle charge feature is active or inactive.