how many plants

So I have an 1000watt hps light. With a 19 inch reflector... how many plants can I put under it? My room it 10ft by 10 ft. How many
plants (same strain) can I fit fitin there with resonable working space.

Your light is best suited to a 4x4 area during flower.

The rest depends on how large you want the plants to grow to become at finish.

Um 6 feet or so

10. Good luck.