Hard to say man, depends on container size, and size of reflector hood.
My friend has the Sunsoaker hood with 1000 watts and puts 20- 24 clones under it with a 3-4 week veg time Sog style. Works well with an average 2 1/2 lbs per harvest.
My book says that a 1000W light covers an 8' X 8' area.
I have my 1000W light in a 8 X 8 room and found that I
can't fill the room as I needed to leave a path around them.
So I get 12 under my light.