Photobiomodulation therapy systems provide a highly effective way to treat many common ailments to the human body. Many embodiments described herein enable two or more light therapy devices to be coupled together in various ways. In some embodiments, the light therapy system includes a first light device and a second light device arranged and configured to be mechanically and/or electrically coupled to the first light device. Each of the light devices may include a housing and a plurality of lights arranged and configured to emit at least one of red light and near infrared light. The first light device and the second light device can be coupled in a side-by-side orientation or a top-to-bottom orientation. The light therapy system can also be coupled to a mobile stand or a door stand.