Each LED in the system draws 1.5 Amperes at 12V; because the LEDs are wired in parallel, that means that the total current draw is 3A at 12V. I decided to add a significant safety factor when purchasing the power supply, and bought a 12V, 5A supply from MPJA. These are medical-grade supplies which were surplused from CPAP machines. That’s an overall benefit because medical grade supplies are engineered to much higher standards and have more safety mechanisms and more stringent certifications than your average switcher. The leads are terminated with a 5.5/2.5mm barrel connector.