Using light to measure physiology has become more and more common, as it's everywhere from smartwatches to sleep trackers.
There are widely accepted standards for how much light is safe [IEC 60825, ANSI Z136], and we follow these standards in our product (Federal Laser Product Performance Standards 21CFR1040.10).
We are registered as a Class 1 Laser Device with the United States Food and Drug Administration Center for Devices and Radiological Health (US FDA CDRH).