Your CosmoGlo light was designed to be used over a flat bed. The flat metal base was designed to be directly under your halo. This video explains how your light will function better in the -C- position vs the 'Z' position.
This doesn't mean that your light can't be put in different positions or placed over different beds or chairs. Your light will still be functional in other positions, however, there may be some side effects from not having your light in the position it was designed for.
Extending the light higher than intended can cause the light to swing on its own or have a slight lean from the halo. This is caused by the halo being top-heavy and needing telescoping poles for proper balance. To avoid this you can lower your light adjustment. If you want the height taller you can try to counterbalance the light by placing something under the base (the end away from the pole) to help balance the light.
When adjusting the height of your light, remember to lift the base to allow your cord room to move freely during adjustment. See the video below.