The 7" LightTower Gen 3 covers an area approximately 3.5 acres. The 5" LightTower Gen 3 covers an area approximately 1.5 acres. The LightTowers require the Home Stand (included with purchase) to expand their coverage area. Without the Home Stand, the LightTowers produce a focused beam of coherent light that is the width of the plates themselves. This is useful for structuring water and using on acupuncture points, areas of pain or areas that require support in healing. By placing the LightTowers on the Home Stand, the field is expanded and benefits people, plants and animals within the field.