With that light you can cover half the space in that tent, that is 4 sq ft. How many plants depends on how long you want to veg. 1 plant per sq ft needs 4 weeks of veg, 1 plant per 2 sq ft will need to veg at least 6 weeks, only 1 plant fir the whole 4 sq ft needs 2 months of veg. Keep in mind that yield depends on the light power you have, not the amount of plants
like 1