Correct sockets to be used with 277v light bulbs
According to the National Electrical Code, the voltage limit on lighting in a dwelling unit (including motels, dormitories, etc) is 120 volts. You are not allowed to use higher voltages for these occupancies. 

The only lighting that normally uses 277 volts is flourescent or HID lighting in a commercial or industrial occupancy. The HID lamps in these locations use mogul bases not medium.

The medium based bulbs you are talking about are probably for use in Europe not the US.