LED Drivers and 12v Power Supply
LED lighting requires either a 'constant current' driver or 'constant voltage' driver.
The light fitting you choose will determine which type of LED driver required.
If it says 350mA or 700mA then you require a 'constant current' driver at that mA to operate the light.
If the fitting doesn't specify mA then you require a 12v 'constant voltage' LED driver to operate it at 12volts.
Use LED drivers or wire wound transformers or magnetic transformers for LED 12v lights.