Vitamin L Pro was adapted from our best-selling Vitamin L energy light and developed with health professionals to provide light therapy in a hospital setting; attached to a drip-stand, it's being used to improve sleep and circadian activity in long-term patients. Outside hospital, the addition of a ball-joint clamp allows you to securely attach Vitamin L Pro to a bar at just the right height and angle. The clamp doubles as a stand so you can still use it in the usual way, on a flat surface in portrait or landscape position.