Are 277V lights wired the same as 120V?
The connection diagram is the same, one hot-leg and one neutral.
But if you do not have 277 volts as your source voltage, connecting
a 277 volt light (usually a ballast) to 120 volt will not work.
Conversely, if you hook up a 120 volt light or appliance to 277
volts, it will quickly become toast.