Apple Watch wearers might occasionally notice green lights on the back of the wearable and, while this is totally normal, it can be worth knowing why they are there, what they do, and how to turn them off. Apple Watch continues to be a popular option for consumers, but getting used to all of the features can take some time. The use of a green light is one such example as it is directly tied to the heart rate sensor.
The Apple Watch can do many things and while the interface is simple enough for the most part, there can be occasions when things seem less clear. For example, and in addition to a green light, Apple Watch wearers may also see a red light on the watch face. Without context, many might assume the red light to be warning of an issue, but it is simply a way for the smartwatch to advise the wearer that there’s a new notification.
In contrast, the green light on an Apple Watch may seem a little more ominous, especially considering it is on the rear of the device and likely to go unnoticed by the wearer most of the time. In fact, the green lights can sometimes turn on even when the watch is not being worn, adding to their mysterious nature. However, the lights are simply used to measure the wearer’s heart rate. Essentially, an Apple Watch uses these green LED lights to detect the amount of blood flow and this is then used to help determine the actual heart rate. At times when the watch is taking more frequent heart rate measurements, the green LED lights will be even more active.
There’s no real reason to turn off the green lights as they are used to measure heart rate. However, there can be times when the watch is inadvertently taking measurements. For example, if the watch is not being worn at the time but the green lights are on and staying on, then it could be a result of a fitness session still in progress, such as a workout. During these times, the watch will be looking to monitor the heart rate more frequency and causing the lights to activate more often. Simply stopping the workout will also stop the green lights from activating.
As they are used to measure heart rate, in cases where users want to totally disable the green lights, then the only option is to completely turn off the heart rate sensor. To do this, simply open the Apple Watch’s Settings app and then navigate to Privacy, followed by Health. Here the user will find the option to tap on Heart Rate and the ability to disable the feature. Again, this will completely stop the Apple Watch from being able to take measurements, requiring the user to enable the feature (and the green lights) if they want to measure their heart rate.
Source: Apple
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