For line driven (ballast bypass) option, the lamp does NOT support 347V or 480V. A step-down transformer must be installed to lower the input voltage to 120V or 277V.
Lunera HID LED G3 lamp support line voltage at 120V ~ 277V. Product warranty will be voided if product is directly installed into voltages above 277VAC.
For ballast driven option, lamp's operation is dependent of the ballast. The ballast itself acts as an step-down transformer lowering 347V / 480V to 120VAC.