@Organja
Whether you are choosing between a 36v or 72v 3590, the process is the same...
Example:
1x 36v running @ 1.4 amps...
you need a drive with at least 36 volts and 1.4 mAmps
Voltage changes for each given amount of amperage....and will fluctuate slightly for the Vf50 measurement given...3-4% of total voltage if cooled properly...so a good idea to run a little extra voltage...
Most people wire Multiple COBs in series because voltage is added together and current remains constant...this is important because the drivers an LEDs use constant current...
Four 36v 3590's wired in a series needs at least
4*34.89= 139.56 volts..and 1.4 amps....The Meanwell HLG 185-1400C, is a good choice because it puts out 144 volts @ 1.4 amps...Perfect fit....
This would draw 195 watts [139.56*1.4][Volts *Amps= Watts] and be 51.67% efficient....meaning that
.5167* 195 = 100.75 Par Watts
[Wiring in parallel keeps voltage constant and shares Current...which can be bad with out extra circuitry or complex]