Sounds like it could be a little short, but read up on training/pruning as some experienced growers are able to make their plants into little bushes that never grow taller than 1ft. Also check out "SoG/SCRoG" grows for some ideas.

Another issue could be the heat, its a very small space and quite a big light. Perhaps consider CFL lights, they are less powerful but a 250w CFL would be ok for a one or two plants and a lot less hot. Whatever you do some sort of air circulation will be a good idea.

I don't want to put you off your grow, it is difinitely possible to grow a plant in there, will just take a lot of planning / reading grow journals / watching youtube