Hey LesLV, thank you for finding the time out to ask us your question about the Samsung Galaxy Watch FE. The green light sensor on your Galaxy Watch FE is essential for your heart rate monitor as well as wrist detection. Although we are unable to turn this off completely, you are able to disable the continuous heart rate monitoring feature, or you can set it to measure at your designated interval. If you have any other questions or if you would like any further assistance, please feel free to reach out to Support. Thank you for being a valued Samsung customer. - Debra