Recommended 12 VAC supply:
CMVision UL Listed Regulated Power Adapter, 12VDC, 1Amp for Camera, LED Light, IR Illuminator
TNTE Wall Adapter Power Supply 12V DC 2.1mm ~ 5.5 mm 1Amp UL listed (5 Pack)
This setup requires a 10 ohm / 10 watt resistor. Buy approved resistor.