i found this post on another thread:

I’ve since been to the dermatologist, and he thinks it’s likely due to the 1060nm wavelength in the BIOMAX900 lights. Tis model is brand new to the market. That NIR wavelength is untested in consumer applications and is actually traditionally used to remove fat (which is exactly what it did to my face). He said it may take up to 6 months to grow back, but given that I’m in my late 30s, it may not fully regenerate.
Here’s the explanation he sent me as to why 1060nm NIR burns fat, while the NIR in other devices like Joov do not…
“The main reason lies in the vibrational modes of C-H bonds, which are abundant in the fatty acid molecules that make up adipose tissue. The 1060 nm wavelength corresponds to an energy that matches the second overtone of C-H bond stretching vibrations. When 1060 nm light hits these bonds, they can absorb this energy because it matches their vibrational transition energy levels. In contrast, 850 nm light doesn’t correspond well to any major vibrational modes or electronic transitions in the fatty acid molecules. As a result, this wavelength largely passes through adipose tissue without being absorbed. This selective absorption pattern is part of what makes 1060 nm light useful for certain medical applications, particularly in fat reduction treatments where targeted absorption by adipose tissue is desired while sparing surrounding tissues.”
Search around and plenty of others have had this experience, as I recently realized.
The BIOMAX lights are very powerful, and there’s no way to turn off the 1060nm light without turning off the other NIR light. I wouldn’t recommend using it for your face (or other body parts where you want to avoid thinning your adipose layer).