How much power is needed to run a vaporizer?

ok, well i just spent about an hour searching to find out how many volts/ watts a common box-style vaporizer needs to run. could some1 that has one look on the bottom of the box for me? it should say how many volts are needed. (in case it seems stupid or unimportant to you i just want to know so i can purchase the right size inverter for it to run off a cigarette lighter in a car.)
thanks

hate to bump, but i'd really like to know plz. any1?