And Diane, the two plants at the back in the pic you posted above are too tall, you can bend the main stem over at 90 degrees halfway up the plant. That way the lower branches will get the same light as the top branches. It will also encourage the lower branches to grow into main cola's, and also put the plants more at the same height as the two smaller one's in the front, so they are all about the same distance from the light.
If the stem is hollow then squash it with your fingers to make it soft before you bend the main stem over, or else it will snap in two.
But if the main stem is too woody, then it will snap too, so depends how the stem is, ideally you want it to be green and flexible.
And with the 1000 W you want to be able to vent the hot air not just out of the tent, but out of the room as well, or else the tent will just be drawing in not only hot air, but also stale air which has the CO2 in it already used up by the plants.