How does the 36V EV battery change into 12V voltage to the LED lamp?
Buy a DC-DC power, convert 36V to 12V, or string directly from 3 12V LED lights
With LM2576 conversion, there are finished products sold, about 6-10 yuan, 3A output current, but also adjustable voltage 1.3-37 Volts
You can install a 48V to 12V converter. Now the 48V converter minimum input voltage can be 31V, then the 36V battery can also be used.