Tech Tips: The secret of the green light in the Smartwatch came out! Read it and you will be amazed

• The green light in the smartwatch is used to measure the heartbeat and pulse with the help of photoplethysmography technology.
• Green light can quickly detect changes in blood, giving the smartwatch accurate readings.
• Smartwatches use a red light instead of green to measure blood oxygen.

Reason Behind Smartwatch Green Light: Nowadays, smartwatches also offer many features similar to smartphones. Everything from calling to messaging can be operated with a smartwatch. So nowadays people usually prefer to buy a smartwatch rather than buying a regular watch. If you are also a smartwatch user, you may have noticed that when you take the smartwatch off your wrist, a green light flashes on the back of the smartwatch for a few seconds.

Be it Apple’s expensive smartwatches or the ones available in the budget-friendly segment, everyone uses Green Light. But now the question is, why is Green Light used in everything from budget friendly smartwatches to thousands of rupees expensive smartwatches? There is a scientific reason behind this. Let’s know about this in detail now.

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Smartwatch measures the user’s pulse

The direct answer is that it is easy to detect the pulse with the help of green light. In fact, the science behind it is very complex. The smartwatch uses a photoplethysmography process to measure the pulse. This technology measures how much blood volume has changed in the tissue and skin. As blood reaches the skin and other organs in the body, the capillaries dilate and contract with the heartbeat. While this process is going on, the smartwatch shines light on the skin and records how much light is reflected back. This number is then displayed in readable form on the screen. (Photo Courtesy – Pinterest)

What if the work of the green light is correct?

Blood contains hemoglobin, which turns red when exposed to oxygen. It absorbs most of the light and reflects light of specific wavelengths. Any red object completely absorbs green light. This is why when a capillary is filled with blood, it absorbs green light completely. This makes it easy for the smartwatch to keep track of when the capillary is full of blood and when it is empty. In addition, green light cannot penetrate the skin as deeply as other colors of light. Hence, the smartwatch takes readings from the body surface itself and records accurate measurements.

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How are other colors of light used?

Green light is not the only thing used in smartwatches. Along with green, the company uses a different color light to make other measurements. The smartwatch uses red light to measure blood oxygen. This measurement is based on a completely different process. So it does not use green light.