120v or 240v

ok so i ordered a 1000 watt ballast mh/hps switchable and its taking to long to get to me so i called the place and asked whats the deal and they said they were backed up and another thing is that they didnt know if i need a 120v or a 240v cord socket or whatever ok now i need to know what is the difference between the 120v or a 240v cord socket thing or whatever and which one of them do i need?? calling all experts

you need 120 unless your house is wired for a welder or something like that,

Depends on where you live. If you are in the US,get the 120v.

is their any bennifit to have 240v over 120v..... I am about to have an electrician wire a room in my house that I plan to grow in