please help me.....

hi everyone can someone please tell me how many plants i should grow, ive got one 400w grow light and a room 2.4m x 1.2m and 2m high is this room too big or too small for one light ????

its the perfect size for a 400w hps and i would recomend 6 papya plants from nirvana youll get allmost 2 zones per plant or more just using miracle grow soil i did it for my first grow and was strapt for cash...good luck...