Neon Power Supply Neon Transformer (Included Dimming Dimmer) Neon Power Supply Neon Transformer ( Included Dimming Dimmer ) Use For Real Beer Bar Neon Signs.Ouput: 0-8 kV. You can adjust the brightness of your neon light sign.Now you can pick the PERFECT brightness! UL Listed Compliance means SAFETY! Protects against open circuit and over heating. And a three-prong power cord insures safety for you!