Here is another smart wearable device that tracks your exposure to light to help you get your sleep cycle on track. The LYS guides you to get more light throughout the day. It also encourages you to avoid blue light at night. The device has a compact, elegant design and can be clipped onto anything.
LYS has a battery that lasts up to 7 days. It is almost as small as a coin. The companion app gives you feedback to help you make the right changes for optimum light exposure. Expected to ship in December.[Source]