I have PSU - constant current with output 1.4A/96W/23-69VDC and shall buy a number of led´s and connect these in series.

What do I need to calculate to know how many of the following led´s I can add to this power supply? can I just do it all by ohms law?

https://www.led-tech.de/en/CREE-XM-L2-T4-on-Star-PCB

My calc. results in app. 48x led´s (though I would only want to push the PSU to say 80% which gives more like 38x).

Just wanted to see if I made this right here since it was a while I did this.

Thanks for your input

I have an LED power supply - constant current with output 1.4A/96W/23-69VDC. I want to buy a number of LEDs and connect these in series.

What do I need to calculate to know how many of the following LEDs I can add to this power supply?

Can I just do it all by Ohm's law?

https://www.led-tech.de/en/CREE-XM-L2-T4-on-Star-PCB

My calculation results in approximately 48 LEDss (though I would only want to push the power supply to say 80% which gives more like 38.)

Just wanted to see if I made this right here since it was a while I did this.